diff --git a/CInterface/Battling/ExperienceLibrary.cpp b/CInterface/Battling/ExperienceLibrary.cpp
index e8609f9..f0382a2 100644
--- a/CInterface/Battling/ExperienceLibrary.cpp
+++ b/CInterface/Battling/ExperienceLibrary.cpp
@@ -8,8 +8,8 @@ export uint8_t PkmnLib_ExperienceLibrary_HandleExperienceGain(ExperienceLibrary*
                                                               CreatureLib::Battling::Creature* faintedMon,
                                                               CreatureLib::Battling::Creature* const* opponents,
                                                               size_t numberOfOpponents) {
-    Try(p->HandleExperienceGain(
-        faintedMon, std::unordered_set<CreatureLib::Battling::Creature*>(opponents, opponents + numberOfOpponents));)
+    Try(p->HandleExperienceGain(faintedMon, std::unordered_set<ArbUt::BorrowedPtr<CreatureLib::Battling::Creature>>(
+                                                opponents, opponents + numberOfOpponents));)
 }
 
 export void PkmnLib_ExperienceLibrary_Destruct(ExperienceLibrary* p) { delete p; }
diff --git a/CInterface/Battling/Pokemon.cpp b/CInterface/Battling/Pokemon.cpp
index 186fe09..fd1c293 100644
--- a/CInterface/Battling/Pokemon.cpp
+++ b/CInterface/Battling/Pokemon.cpp
@@ -12,7 +12,7 @@ export Pokemon* PkmnLib_Pokemon_Construct(const BattleLibrary* library, const Pk
                                           uint8_t spIv, uint8_t hpEv, uint8_t attEv, uint8_t defEv, uint8_t sAtEv,
                                           uint8_t sDeEv, uint8_t spEv, const PkmnLib::Library::Nature* nature) {
     std::string nick(nickname);
-    ArbUt::List<CreatureLib::Battling::LearnedAttack*> cMoves(moves, moves + moveCount);
+    std::vector<CreatureLib::Battling::LearnedAttack*> cMoves(moves, moves + moveCount);
 
     return new Pokemon(library, species, forme, level, experience, uid, gender, coloring, heldItem, nick,
                        CreatureLib::Library::TalentIndex(hiddenAbility, abilityIndex), cMoves,
@@ -24,9 +24,11 @@ export void PkmnLib_Pokemon_Destruct(const Pokemon* p) { delete p; }
 
 #define SIMPLE_GET_FUNC(type, name, returnType)                                                                        \
     export returnType PkmnLib_##type##_##name(const PkmnLib::Battling::type* p) { return p->name(); }
+#define SIMPLE_GET_FUNC_SMART_PTR(type, name, returnType)                                                              \
+    export returnType PkmnLib_##type##_##name(const PkmnLib::Battling::type* p) { return p->name().operator->(); }
 
 SIMPLE_GET_FUNC(Pokemon, IsShiny, bool)
-SIMPLE_GET_FUNC(Pokemon, GetNature, const PkmnLib::Library::Nature*)
+SIMPLE_GET_FUNC_SMART_PTR(Pokemon, GetNature, const PkmnLib::Library::Nature*)
 
 #undef SIMPLE_GET_FUNC
 
@@ -35,4 +37,7 @@ export uint8_t PkmnLib_Pokemon_GetIndividualValue(const Pokemon* p, CreatureLib:
 }
 export uint8_t PkmnLib_Pokemon_GetEffortValue(const Pokemon* p, CreatureLib::Library::Statistic stat) {
     return p->GetEffortValue(stat);
-}
\ No newline at end of file
+}
+
+#undef SIMPLE_GET_FUNC
+#undef SIMPLE_GET_FUNC_SMART_PTR
\ No newline at end of file
diff --git a/CInterface/Library/EvolutionData.cpp b/CInterface/Library/EvolutionData.cpp
index e6a0830..7a608b2 100644
--- a/CInterface/Library/EvolutionData.cpp
+++ b/CInterface/Library/EvolutionData.cpp
@@ -49,16 +49,16 @@ export const EvolutionData* PkmnLib_Evolution_CreateTradeWithSpeciesEvolution(co
 }
 export const EvolutionData* PkmnLib_Evolution_CreateCustomEvolution(const CreatureLib::Library::EffectParameter** data,
                                                                     size_t dataLength, const PokemonSpecies* into) {
-    auto list = ArbUt::List<const CreatureLib::Library::EffectParameter*>(data, data + dataLength);
+    auto list = std::vector<const CreatureLib::Library::EffectParameter*>(data, data + dataLength);
     return EvolutionData::CreateCustomEvolution(list, into);
 }
 
 export EvolutionMethod PkmnLib_Evolution_GetMethod(const EvolutionData* data) { return data->GetMethod(); }
 export const PokemonSpecies* PkmnLib_Evolution_GetNewSpecies(const EvolutionData* data) {
-    return data->GetNewSpecies();
+    return data->GetNewSpecies().GetRaw();
 }
 export size_t PkmnLib_Evolution_GetDataCount(const EvolutionData* data) { return data->GetDataCount(); }
 export uint8_t PkmnLib_Evolution_GetData(const EvolutionData* data, size_t index,
                                          const CreatureLib::Library::EffectParameter*& out) {
-    Try(out = data->GetData(index));
+    Try(out = data->GetData(index).GetRaw());
 }
diff --git a/CInterface/Library/NatureLibrary.cpp b/CInterface/Library/NatureLibrary.cpp
index 55f140e..b050c62 100644
--- a/CInterface/Library/NatureLibrary.cpp
+++ b/CInterface/Library/NatureLibrary.cpp
@@ -11,7 +11,7 @@ export uint8_t PkmnLib_NatureLibrary_LoadNature(NatureLibrary* p, const char* na
     Try(p->LoadNature(ArbUt::CaseInsensitiveConstString(name), nature);)
 }
 export uint8_t PkmnLib_NatureLibrary_GetNatureByName(NatureLibrary* p, const char* name, const Nature*& out) {
-    Try(out = p->GetNatureByName(ArbUt::CaseInsensitiveConstString(name)));
+    Try(out = p->GetNatureByName(ArbUt::CaseInsensitiveConstString(name)).GetRaw());
 }
 
 export const char* PkmnLib_NatureLibrary_GetRandomNatureName(NatureLibrary* p, ArbUt::Random* rand) {
diff --git a/CInterface/Library/PokemonLibrary.cpp b/CInterface/Library/PokemonLibrary.cpp
index 3ac6f34..e4520b2 100644
--- a/CInterface/Library/PokemonLibrary.cpp
+++ b/CInterface/Library/PokemonLibrary.cpp
@@ -12,5 +12,5 @@ export uint8_t PkmnLib_PokemonLibrary_Construct(PokemonLibrary*& out, PkmnLib::L
 
 export void PkmnLib_PokemonLibrary_Destruct(const PokemonLibrary* p) { delete p; }
 export const NatureLibrary* PkmnLib_PokemonLibrary_GetNatureLibrary(const PokemonLibrary* p) {
-    return p->GetNatureLibrary();
+    return p->GetNatureLibrary().GetRaw();
 }
\ No newline at end of file
diff --git a/CInterface/Library/PokemonSpecies.cpp b/CInterface/Library/PokemonSpecies.cpp
index 631f4c3..72bac22 100644
--- a/CInterface/Library/PokemonSpecies.cpp
+++ b/CInterface/Library/PokemonSpecies.cpp
@@ -24,5 +24,5 @@ export void PkmnLib_PokemonSpecies_AddEvolution(PokemonSpecies* p, EvolutionData
 export size_t PkmnLib_PokemonSpecies_GetEvolutionCount(const PokemonSpecies* p) { return p->GetEvolutions().Count(); }
 
 export uint8_t PkmnLib_PokemonSpecies_GetEvolution(const PokemonSpecies* p, size_t index, const EvolutionData*& out) {
-    Try(out = p->GetEvolutions().At(index));
+    Try(out = p->GetEvolutions().At(index).GetRaw());
 }
\ No newline at end of file
diff --git a/src/Battling/Battle/Battle.cpp b/src/Battling/Battle/Battle.cpp
index f9d8f75..51f9488 100644
--- a/src/Battling/Battle/Battle.cpp
+++ b/src/Battling/Battle/Battle.cpp
@@ -2,14 +2,13 @@
 void PkmnLib::Battling::Battle::SetWeather(const ArbUt::CaseInsensitiveConstString& name) {
     if (_weatherScript != nullptr) {
         _weatherScript->OnRemove();
-        delete _weatherScript;
     }
-    _weatherScript = _library->LoadScript(static_cast<ScriptCategory>(PkmnScriptCategory::Weather), name);
+    _weatherScript = std::unique_ptr<CreatureLib::Battling::Script>(
+        _library->LoadScript(static_cast<ScriptCategory>(PkmnScriptCategory::Weather), name));
     _eventHook.TriggerEvent(new WeatherChangeEvent(name));
 }
 void PkmnLib::Battling::Battle::ClearWeather() {
     _weatherScript->OnRemove();
-    delete _weatherScript;
     _weatherScript = nullptr;
     _eventHook.TriggerEvent(new WeatherChangeEvent(""_cnc));
 }
diff --git a/src/Battling/Battle/Battle.hpp b/src/Battling/Battle/Battle.hpp
index 903c24d..39c18f1 100644
--- a/src/Battling/Battle/Battle.hpp
+++ b/src/Battling/Battle/Battle.hpp
@@ -9,7 +9,7 @@
 namespace PkmnLib::Battling {
     class Battle : public CreatureLib::Battling::Battle {
     private:
-        CreatureLib::Battling::Script* _weatherScript = nullptr;
+        std::unique_ptr<CreatureLib::Battling::Script> _weatherScript = nullptr;
 
     public:
         Battle(const BattleLibrary* library, const ArbUt::List<CreatureLib::Battling::BattleParty*>& parties,
diff --git a/src/Battling/Library/BattleLibrary.hpp b/src/Battling/Library/BattleLibrary.hpp
index 1fc7cdd..e998425 100644
--- a/src/Battling/Library/BattleLibrary.hpp
+++ b/src/Battling/Library/BattleLibrary.hpp
@@ -40,7 +40,9 @@ namespace PkmnLib::Battling {
             return reinterpret_cast<const std::unique_ptr<const Library::ItemLibrary>&>(_staticLib->GetItemLibrary());
         }
 
-        const Library::NatureLibrary* GetNatureLibrary() const { return GetStaticLib()->GetNatureLibrary(); }
+        const ArbUt::BorrowedPtr<const Library::NatureLibrary> GetNatureLibrary() const {
+            return GetStaticLib()->GetNatureLibrary();
+        }
 
         static CreatureLib::Battling::ScriptResolver* CreateScriptResolver();
     };
diff --git a/src/Battling/Library/DamageLibrary.cpp b/src/Battling/Library/DamageLibrary.cpp
index f76579e..e202fa2 100644
--- a/src/Battling/Library/DamageLibrary.cpp
+++ b/src/Battling/Library/DamageLibrary.cpp
@@ -28,7 +28,7 @@ float PkmnLib::Battling::DamageLibrary::GetStatModifier(CreatureLib::Battling::E
     // HOOK: allow overriding for which users stat we use.
     CreatureLib::Library::Statistic offensiveStat;
     CreatureLib::Library::Statistic defensiveStat;
-    auto learnedMove = static_cast<LearnedMove*>(attack->GetAttack());
+    auto learnedMove = attack->GetAttack().ForceAs<LearnedMove>();
     auto moveData = learnedMove->GetMoveData();
     if (moveData->GetCategory() == Library::MoveCategory::Physical) {
         offensiveStat = Library::Statistic::PhysicalAttack;
diff --git a/src/Battling/Library/ExperienceLibrary.cpp b/src/Battling/Library/ExperienceLibrary.cpp
index 6fb43e9..118bad6 100644
--- a/src/Battling/Library/ExperienceLibrary.cpp
+++ b/src/Battling/Library/ExperienceLibrary.cpp
@@ -3,20 +3,21 @@
 #include "../PkmnScriptHook.hpp"
 #include "../Pokemon/Pokemon.hpp"
 
-static inline uint32_t CalculateDynamicExperience(uint8_t level, float v1, CreatureLib::Battling::Creature* op,
-                                                  CreatureLib::Battling::Creature* faintedMon) {
+static inline uint32_t CalculateDynamicExperience(uint8_t level, float v1,
+                                                  ArbUt::BorrowedPtr<CreatureLib::Battling::Creature> op,
+                                                  ArbUt::BorrowedPtr<CreatureLib::Battling::Creature> faintedMon) {
     float a = 2 * level + 10;
     float b = level + op->GetLevel() + 10;
     float v2 = (a * a * sqrt(a)) / (b * b * sqrt(b));
     uint32_t experienceGain = v1 * v2 + 1;
     // TODO: Check owner and international
-    PKMN_HOOK(ModifyExperienceGain, op, faintedMon, op, &experienceGain);
+    PKMN_HOOK(ModifyExperienceGain, op, faintedMon.GetRaw(), op.GetRaw(), &experienceGain);
     return experienceGain;
 }
 
 void PkmnLib::Battling::ExperienceLibrary::HandleExperienceGain(
     CreatureLib::Battling::Creature* faintedMon,
-    const std::unordered_set<CreatureLib::Battling::Creature*>& opponents) const {
+    const std::unordered_set<ArbUt::BorrowedPtr<CreatureLib::Battling::Creature>>& opponents) const {
 
     auto fainted = dynamic_cast<Pokemon*>(faintedMon);
     auto expGain = fainted->GetForme()->GetBaseExperience();
diff --git a/src/Battling/Library/ExperienceLibrary.hpp b/src/Battling/Library/ExperienceLibrary.hpp
index 98e053f..1e61c54 100644
--- a/src/Battling/Library/ExperienceLibrary.hpp
+++ b/src/Battling/Library/ExperienceLibrary.hpp
@@ -5,8 +5,9 @@
 namespace PkmnLib::Battling {
     class ExperienceLibrary : public CreatureLib::Battling::ExperienceLibrary {
     public:
-        void HandleExperienceGain(CreatureLib::Battling::Creature* faintedMon,
-                                  const std::unordered_set<CreatureLib::Battling::Creature*>& opponents) const override;
+        void HandleExperienceGain(
+            CreatureLib::Battling::Creature* faintedMon,
+            const std::unordered_set<ArbUt::BorrowedPtr<CreatureLib::Battling::Creature>>& opponents) const override;
     };
 }
 
diff --git a/src/Battling/Library/MiscLibrary.hpp b/src/Battling/Library/MiscLibrary.hpp
index dec22d5..b365254 100644
--- a/src/Battling/Library/MiscLibrary.hpp
+++ b/src/Battling/Library/MiscLibrary.hpp
@@ -7,24 +7,22 @@
 
 namespace PkmnLib::Battling {
     class MiscLibrary : public CreatureLib::Battling::MiscLibrary {
-        PkmnLib::Library::MoveData* _struggleData =
-            new PkmnLib::Library::MoveData("struggle"_cnc, 0, PkmnLib::Library::MoveCategory::Physical, 50, 255, 10,
-                                           CreatureLib::Library::AttackTarget::Any, 0,
-                                           new CreatureLib::Library::SecondaryEffect(-1, "struggle"_cnc, {}), {});
+        std::unique_ptr<const PkmnLib::Library::MoveData> _struggleData = std::make_unique<PkmnLib::Library::MoveData>(
+            "struggle"_cnc, 0, PkmnLib::Library::MoveCategory::Physical, 50, 255, 10,
+            CreatureLib::Library::AttackTarget::Any, 0,
+            new CreatureLib::Library::SecondaryEffect(-1, "struggle"_cnc, {}), std::unordered_set<uint32_t>());
         ;
-        CreatureLib::Battling::LearnedAttack* _struggle =
-            new PkmnLib::Battling::LearnedMove(_struggleData, CreatureLib::Battling::AttackLearnMethod::Unknown);
+        std::unique_ptr<CreatureLib::Battling::LearnedAttack> _struggle =
+            std::make_unique<PkmnLib::Battling::LearnedMove>(_struggleData,
+                                                             CreatureLib::Battling::AttackLearnMethod::Unknown);
 
-        [[nodiscard]] CreatureLib::Battling::LearnedAttack* GetReplacementAttack() const {
+        [[nodiscard]] ArbUt::BorrowedPtr<CreatureLib::Battling::LearnedAttack> GetReplacementAttack() const {
             _struggle->RestoreAllUses();
             return _struggle;
         }
 
     public:
-        ~MiscLibrary() override {
-            delete _struggle;
-            delete _struggleData;
-        };
+        ~MiscLibrary() override = default;
         bool IsCritical(CreatureLib::Battling::ExecutingAttack* attack, CreatureLib::Battling::Creature* target,
                         uint8_t hit) const override;
         bool CanFlee(CreatureLib::Battling::FleeTurnChoice* switchChoice) const override;
diff --git a/src/Battling/Pokemon/CreatePokemon.cpp b/src/Battling/Pokemon/CreatePokemon.cpp
index 75df60e..a7ae631 100644
--- a/src/Battling/Pokemon/CreatePokemon.cpp
+++ b/src/Battling/Pokemon/CreatePokemon.cpp
@@ -74,14 +74,14 @@ PkmnLib::Battling::Pokemon* PkmnLib::Battling::CreatePokemon::Build() {
     }
     auto experience = _library->GetGrowthRateLibrary()->CalculateExperience(species->GetGrowthRate(), _level);
 
-    auto attacks = ArbUt::List<CreatureLib::Battling::LearnedAttack*>(_attacks.Count());
+    auto attacks = std::vector<CreatureLib::Battling::LearnedAttack*>(_attacks.Count());
     for (size_t i = 0; i < _attacks.Count(); i++) {
         auto& kv = _attacks[i];
         auto move = kv.Move;
         if (move != nullptr)
-            attacks.Append(new LearnedMove(move, kv.LearnMethod));
+            attacks[i] = new LearnedMove(move, kv.LearnMethod);
         else
-            attacks.Append(nullptr);
+            attacks[i] = nullptr;
     }
     auto ivs = CreatureLib::Library::StatisticSet(_ivHp, _ivAttack, _ivDefense, _ivSpAtt, _ivSpDef, _ivSpeed);
     auto evs = CreatureLib::Library::StatisticSet(_evHp, _evAttack, _evDefense, _evSpAtt, _evSpDef, _evSpeed);
diff --git a/src/Battling/Pokemon/CreatePokemon.hpp b/src/Battling/Pokemon/CreatePokemon.hpp
index 3baeb52..6df8d7b 100644
--- a/src/Battling/Pokemon/CreatePokemon.hpp
+++ b/src/Battling/Pokemon/CreatePokemon.hpp
@@ -6,7 +6,7 @@
 namespace PkmnLib::Battling {
     class CreatePokemon {
     private:
-        const BattleLibrary* _library;
+        ArbUt::BorrowedPtr<const BattleLibrary> _library;
         ArbUt::CaseInsensitiveConstString _species = ""_cnc;
         ArbUt::CaseInsensitiveConstString _forme = "default"_cnc;
         uint8_t _level;
diff --git a/src/Battling/Pokemon/Pokemon.hpp b/src/Battling/Pokemon/Pokemon.hpp
index c757718..a6d60c3 100644
--- a/src/Battling/Pokemon/Pokemon.hpp
+++ b/src/Battling/Pokemon/Pokemon.hpp
@@ -13,21 +13,23 @@ namespace PkmnLib::Battling {
         CreatureLib::Library::StatisticSet<uint8_t> _individualValues;
         CreatureLib::Library::StatisticSet<uint8_t> _effortValues;
 
-        const PkmnLib::Library::Nature* _nature;
+        ArbUt::BorrowedPtr<const PkmnLib::Library::Nature> _nature;
 
-        const BattleLibrary* GetLibrary() const { return reinterpret_cast<const BattleLibrary*>(_library); }
+        ArbUt::BorrowedPtr<const BattleLibrary> GetLibrary() const { return _library.ForceAs<const BattleLibrary>(); }
 
     public:
-        Pokemon(const BattleLibrary* library, const ArbUt::BorrowedPtr<const Library::PokemonSpecies>& species,
+        Pokemon(ArbUt::BorrowedPtr<const BattleLibrary> library,
+                const ArbUt::BorrowedPtr<const Library::PokemonSpecies>& species,
                 const ArbUt::BorrowedPtr<const Library::PokemonForme>& forme, uint8_t level, uint32_t experience,
                 uint32_t uid, CreatureLib::Library::Gender gender, uint8_t coloring,
                 ArbUt::BorrowedPtr<const Library::Item> heldItem, const std::string& nickname,
                 const CreatureLib::Library::TalentIndex& talent,
-                const ArbUt::List<CreatureLib::Battling::LearnedAttack*>& moves,
+                const std::vector<CreatureLib::Battling::LearnedAttack*>& moves,
                 CreatureLib::Library::StatisticSet<uint8_t> individualValues,
-                CreatureLib::Library::StatisticSet<uint8_t> effortValues, const PkmnLib::Library::Nature* nature,
-                bool allowedExperienceGain = true)
-            : CreatureLib::Battling::Creature(library, species.As<const CreatureLib::Library::CreatureSpecies>(),
+                CreatureLib::Library::StatisticSet<uint8_t> effortValues,
+                ArbUt::BorrowedPtr<const PkmnLib::Library::Nature> nature, bool allowedExperienceGain = true)
+            : CreatureLib::Battling::Creature(library.ForceAs<const CreatureLib::Battling::BattleLibrary>(),
+                                              species.ForceAs<const CreatureLib::Library::CreatureSpecies>(),
                                               forme.As<const CreatureLib::Library::SpeciesVariant>(), level, experience,
                                               uid, gender, coloring, heldItem.As<const CreatureLib::Library::Item>(),
                                               nickname, talent, moves, allowedExperienceGain),
@@ -43,7 +45,7 @@ namespace PkmnLib::Battling {
             return reinterpret_cast<const ArbUt::List<LearnedMove*>&>(_attacks);
         }
 
-        inline const Library::Nature* GetNature() const noexcept { return _nature; }
+        inline const ArbUt::BorrowedPtr<const PkmnLib::Library::Nature>& GetNature() const noexcept { return _nature; }
         inline uint8_t GetIndividualValue(CreatureLib::Library::Statistic stat) const {
             return _individualValues.GetStat(stat);
         }
diff --git a/src/Battling/Pokemon/PokemonParty.hpp b/src/Battling/Pokemon/PokemonParty.hpp
index 2ed8e4d..1ebb8f8 100644
--- a/src/Battling/Pokemon/PokemonParty.hpp
+++ b/src/Battling/Pokemon/PokemonParty.hpp
@@ -12,8 +12,8 @@ namespace PkmnLib::Battling {
         PokemonParty(std::initializer_list<CreatureLib::Battling::Creature*> party)
             : CreatureLib::Battling::CreatureParty(party) {}
 
-        Pokemon* GetAtIndex(int index) const {
-            return dynamic_cast<Pokemon*>(CreatureLib::Battling::CreatureParty::GetAtIndex(index));
+        ArbUt::BorrowedPtr<Pokemon> GetAtIndex(int index) const {
+            return CreatureLib::Battling::CreatureParty::GetAtIndex(index).As<Pokemon>();
         }
     };
 }
diff --git a/src/Library/Evolutions/EvolutionData.hpp b/src/Library/Evolutions/EvolutionData.hpp
index 31e1abf..cb652dd 100644
--- a/src/Library/Evolutions/EvolutionData.hpp
+++ b/src/Library/Evolutions/EvolutionData.hpp
@@ -2,12 +2,15 @@
 #define PKMNLIB_EVOLUTIONDATA_HPP
 
 #include <Arbutils/Collections/List.hpp>
+#include <Arbutils/Memory/BorrowedPtr.hpp>
+#include <Arbutils/Memory/UniquePtrList.hpp>
 #include <CreatureLib/Library/EffectParameter.hpp>
 #include <CreatureLib/Library/Gender.hpp>
 #include <string>
 #include <utility>
 #include "../TimeOfDay.hpp"
 #include "EvolutionMethod.hpp"
+
 namespace PkmnLib::Library {
     class PokemonSpecies;
     class MoveData;
@@ -15,20 +18,16 @@ namespace PkmnLib::Library {
 
     class EvolutionData {
     private:
-        const PokemonSpecies* _evolvesInto;
+        ArbUt::BorrowedPtr<const PokemonSpecies> _evolvesInto;
         EvolutionMethod _method;
-        ArbUt::List<const CreatureLib::Library::EffectParameter*> _evolutionData;
+        ArbUt::UniquePtrList<const CreatureLib::Library::EffectParameter> _evolutionData;
 
-        EvolutionData(EvolutionMethod method, ArbUt::List<const CreatureLib::Library::EffectParameter*> data,
+        EvolutionData(EvolutionMethod method, std::vector<const CreatureLib::Library::EffectParameter*> data,
                       const PokemonSpecies* next)
             : _evolvesInto(next), _method(method), _evolutionData(std::move(data)) {}
 
     public:
-        ~EvolutionData() {
-            for (auto v : _evolutionData) {
-                delete v;
-            }
-        }
+        ~EvolutionData() = default;
 
         static inline const EvolutionData* CreateLevelEvolution(uint8_t level, const PokemonSpecies* into) {
             return new EvolutionData(EvolutionMethod::Level,
@@ -67,15 +66,18 @@ namespace PkmnLib::Library {
         static const EvolutionData* CreateTradeWithSpeciesEvolution(const PokemonSpecies* traded,
                                                                     const PokemonSpecies* into);
         static inline const EvolutionData*
-        CreateCustomEvolution(const ArbUt::List<const CreatureLib::Library::EffectParameter*>& data,
+        CreateCustomEvolution(const std::vector<const CreatureLib::Library::EffectParameter*>& data,
                               const PokemonSpecies* into) {
             return new EvolutionData(EvolutionMethod::Custom, data, into);
         }
 
-        [[nodiscard]] inline const PokemonSpecies* GetNewSpecies() const noexcept { return _evolvesInto; }
+        [[nodiscard]] inline ArbUt::BorrowedPtr<const PokemonSpecies> GetNewSpecies() const noexcept {
+            return _evolvesInto;
+        }
         [[nodiscard]] inline EvolutionMethod GetMethod() const noexcept { return _method; }
         [[nodiscard]] inline size_t GetDataCount() const noexcept { return _evolutionData.Count(); }
-        [[nodiscard]] inline const CreatureLib::Library::EffectParameter* GetData(size_t index) const {
+        [[nodiscard]] inline ArbUt::BorrowedPtr<const CreatureLib::Library::EffectParameter>
+        GetData(size_t index) const {
             return _evolutionData.At(index);
         }
     };
diff --git a/src/Library/Natures/NatureLibrary.hpp b/src/Library/Natures/NatureLibrary.hpp
index d781aec..d03b132 100644
--- a/src/Library/Natures/NatureLibrary.hpp
+++ b/src/Library/Natures/NatureLibrary.hpp
@@ -4,49 +4,44 @@
 #include <Arbutils/Collections/Dictionary.hpp>
 #include <Arbutils/Collections/List.hpp>
 #include <Arbutils/ConstString.hpp>
+#include <Arbutils/Memory/BorrowedPtr.hpp>
 #include <Arbutils/Random.hpp>
 #include <CreatureLib/Library/Exceptions/CreatureException.hpp>
 #include <unordered_map>
 #include <vector>
 #include "Nature.hpp"
+
 namespace PkmnLib::Library {
     class NatureLibrary {
     private:
-        ArbUt::Dictionary<ArbUt::CaseInsensitiveConstString, const Nature*> _items;
+        std::unordered_map<ArbUt::CaseInsensitiveConstString, std::unique_ptr<const Nature>> _items;
 
     public:
-        explicit NatureLibrary(size_t size = 32) noexcept
-            : _items(ArbUt::Dictionary<ArbUt::CaseInsensitiveConstString, const Nature*>(size)) {}
+        explicit NatureLibrary(size_t size = 32) noexcept : _items(size) {}
 
-        ~NatureLibrary() {
-            for (auto& kv : _items) {
-                delete kv.second;
-            }
-        }
+        ~NatureLibrary() = default;
 
         inline void LoadNature(const ArbUt::CaseInsensitiveConstString& name, const Nature* nature) {
-            _items.Insert(name, nature);
+            _items.insert({name, std::unique_ptr<const Nature>(nature)});
         }
 
-        inline const Nature* GetNatureByName(const ArbUt::CaseInsensitiveConstString& name) const {
-            return _items[name];
+        inline ArbUt::BorrowedPtr<const Nature> GetNatureByName(const ArbUt::CaseInsensitiveConstString& name) const {
+            return _items.at(name);
         }
 
         inline const ArbUt::CaseInsensitiveConstString&
         GetRandomNatureName(ArbUt::Random rand = ArbUt::Random()) const {
-            auto i = rand.Get(_items.Count());
-            auto& map = _items.GetStdMap();
-            return std::next(std::begin(map), i)->first;
+            auto i = rand.Get(_items.size());
+            return std::next(std::begin(_items), i)->first;
         }
         inline const ArbUt::CaseInsensitiveConstString& GetRandomNatureName(ArbUt::Random* rand) const {
-            auto i = rand->Get(_items.Count());
-            auto& map = _items.GetStdMap();
-            return std::next(std::begin(map), i)->first;
+            auto i = rand->Get(_items.size());
+            return std::next(std::begin(_items), i)->first;
         }
 
-        inline ArbUt::CaseInsensitiveConstString GetNatureName(const Nature* nature) {
+        inline ArbUt::CaseInsensitiveConstString GetNatureName(ArbUt::BorrowedPtr<const Nature> nature) {
             for (const auto& v : _items) {
-                if (v.second == nature) {
+                if (v.second.get() == nature.GetRaw()) {
                     return v.first;
                 }
             }
diff --git a/src/Library/PokemonLibrary.hpp b/src/Library/PokemonLibrary.hpp
index 9f702d6..976c489 100644
--- a/src/Library/PokemonLibrary.hpp
+++ b/src/Library/PokemonLibrary.hpp
@@ -11,10 +11,10 @@
 namespace PkmnLib::Library {
     class PokemonLibrary : public CreatureLib::Library::DataLibrary {
     private:
-        const NatureLibrary* _natures;
+        std::unique_ptr<const NatureLibrary> _natures;
 
     public:
-        ~PokemonLibrary() override { delete _natures; }
+        ~PokemonLibrary() override = default;
 
         PokemonLibrary(PkmnLib::Library::LibrarySettings* settings, SpeciesLibrary* species, MoveLibrary* moves,
                        ItemLibrary* items, CreatureLib::Library::GrowthRateLibrary* growthRates,
@@ -37,7 +37,7 @@ namespace PkmnLib::Library {
             return (const std::unique_ptr<const ItemLibrary>&)CreatureLib::Library::DataLibrary::GetItemLibrary();
         }
 
-        [[nodiscard]] const NatureLibrary* GetNatureLibrary() const noexcept { return _natures; }
+        [[nodiscard]] ArbUt::BorrowedPtr<const NatureLibrary> GetNatureLibrary() const noexcept { return _natures; }
     };
 }
 
diff --git a/src/Library/Species/PokemonSpecies.hpp b/src/Library/Species/PokemonSpecies.hpp
index a9ee7f7..d025601 100644
--- a/src/Library/Species/PokemonSpecies.hpp
+++ b/src/Library/Species/PokemonSpecies.hpp
@@ -1,5 +1,6 @@
 #ifndef PKMNLIB_POKEMONSPECIES_HPP
 #define PKMNLIB_POKEMONSPECIES_HPP
+#include <Arbutils/Memory/UniquePtrList.hpp>
 #include <CreatureLib/Battling/Models/Creature.hpp>
 #include "../Evolutions/EvolutionData.hpp"
 #include "PokemonForme.hpp"
@@ -8,7 +9,7 @@ namespace PkmnLib::Library {
     class PokemonSpecies : public CreatureLib::Library::CreatureSpecies {
     private:
         uint8_t _baseHappiness;
-        ArbUt::List<const EvolutionData*> _evolutions;
+        ArbUt::UniquePtrList<const EvolutionData> _evolutions;
 
     public:
         PokemonSpecies(uint16_t id, const ArbUt::CaseInsensitiveConstString& name, const PokemonForme* defaultForme,
@@ -17,11 +18,7 @@ namespace PkmnLib::Library {
             : CreatureSpecies(id, name, defaultForme, genderRatio, growthRate, captureRate),
               _baseHappiness(baseHappiness) {}
 
-        ~PokemonSpecies() override {
-            for (auto evo : _evolutions) {
-                delete evo;
-            }
-        }
+        ~PokemonSpecies() override = default;
 
         inline uint8_t GetBaseHappiness() const { return _baseHappiness; }
 
@@ -44,7 +41,7 @@ namespace PkmnLib::Library {
         }
 
         inline void AddEvolution(const EvolutionData* data) noexcept { _evolutions.Append(data); }
-        const ArbUt::List<const EvolutionData*>& GetEvolutions() const noexcept { return _evolutions; }
+        const ArbUt::UniquePtrList<const EvolutionData>& GetEvolutions() const noexcept { return _evolutions; }
     };
 }
 
diff --git a/tests/LibraryTests/SpeciesTests.cpp b/tests/LibraryTests/SpeciesTests.cpp
index 7233412..62e50d2 100644
--- a/tests/LibraryTests/SpeciesTests.cpp
+++ b/tests/LibraryTests/SpeciesTests.cpp
@@ -145,7 +145,7 @@ TEST_CASE("Able to set and get evolution", "library") {
         0.5f, "testGrowthRate"_cnc, 100, 100);
 
     species->AddEvolution(PkmnLib::Library::EvolutionData::CreateLevelEvolution(16, species2));
-    auto evolutions = species->GetEvolutions();
+    auto& evolutions = species->GetEvolutions();
     REQUIRE(evolutions.Count() == 1);
     auto evo = evolutions[0];
     CHECK(evo->GetMethod() == PkmnLib::Library::EvolutionMethod::Level);