diff --git a/apps/openmw/mwmechanics/creaturestats.cpp b/apps/openmw/mwmechanics/creaturestats.cpp
index b18bca98d5..41af96a630 100644
--- a/apps/openmw/mwmechanics/creaturestats.cpp
+++ b/apps/openmw/mwmechanics/creaturestats.cpp
@@ -193,15 +193,6 @@ namespace MWMechanics
         mLevel = level;
     }
 
-    void CreatureStats::modifyMagicEffects(const MagicEffects& effects)
-    {
-        bool recalc = effects.getOrDefault(ESM::MagicEffect::FortifyMaximumMagicka).getModifier()
-            != mMagicEffects.getOrDefault(ESM::MagicEffect::FortifyMaximumMagicka).getModifier();
-        mMagicEffects.setModifiers(effects);
-        if (recalc)
-            recalculateMagicka();
-    }
-
     void CreatureStats::setAiSetting(AiSetting index, Stat<int> value)
     {
         mAiSettings[static_cast<std::underlying_type_t<AiSetting>>(index)] = value;
diff --git a/apps/openmw/mwmechanics/creaturestats.hpp b/apps/openmw/mwmechanics/creaturestats.hpp
index f65e1a000f..02312385d7 100644
--- a/apps/openmw/mwmechanics/creaturestats.hpp
+++ b/apps/openmw/mwmechanics/creaturestats.hpp
@@ -155,9 +155,6 @@ namespace MWMechanics
 
         void setDynamic(int index, const DynamicStat<float>& value);
 
-        /// Set Modifier for each magic effect according to \a effects. Does not touch Base values.
-        void modifyMagicEffects(const MagicEffects& effects);
-
         void setAttackingOrSpell(bool attackingOrSpell) { mAttackingOrSpell = attackingOrSpell; }
 
         void setAttackType(std::string_view attackType) { mAttackType = attackType; }
diff --git a/apps/openmw/mwmechanics/magiceffects.cpp b/apps/openmw/mwmechanics/magiceffects.cpp
index c2afef7c0d..e4210ed8fc 100644
--- a/apps/openmw/mwmechanics/magiceffects.cpp
+++ b/apps/openmw/mwmechanics/magiceffects.cpp
@@ -121,11 +121,6 @@ namespace MWMechanics
         return *this;
     }
 
-    void MagicEffects::remove(const EffectKey& key)
-    {
-        mCollection.erase(key);
-    }
-
     void MagicEffects::add(const EffectKey& key, const EffectParam& param)
     {
         Collection::iterator iter = mCollection.find(key);
@@ -145,19 +140,6 @@ namespace MWMechanics
         mCollection[key].modifyBase(diff);
     }
 
-    void MagicEffects::setModifiers(const MagicEffects& effects)
-    {
-        for (Collection::iterator it = mCollection.begin(); it != mCollection.end(); ++it)
-        {
-            it->second.setModifier(effects.getOrDefault(it->first).getModifier());
-        }
-
-        for (Collection::const_iterator it = effects.begin(); it != effects.end(); ++it)
-        {
-            mCollection[it->first].setModifier(it->second.getModifier());
-        }
-    }
-
     EffectParam MagicEffects::getOrDefault(const EffectKey& key) const
     {
         return get(key).value_or(EffectParam());
@@ -174,40 +156,6 @@ namespace MWMechanics
         return std::nullopt;
     }
 
-    MagicEffects MagicEffects::diff(const MagicEffects& prev, const MagicEffects& now)
-    {
-        MagicEffects result;
-
-        // adding/changing
-        for (Collection::const_iterator iter(now.begin()); iter != now.end(); ++iter)
-        {
-            Collection::const_iterator other = prev.mCollection.find(iter->first);
-
-            if (other == prev.end())
-            {
-                // adding
-                result.add(iter->first, iter->second);
-            }
-            else
-            {
-                // changing
-                result.add(iter->first, iter->second - other->second);
-            }
-        }
-
-        // removing
-        for (Collection::const_iterator iter(prev.begin()); iter != prev.end(); ++iter)
-        {
-            Collection::const_iterator other = now.mCollection.find(iter->first);
-            if (other == now.end())
-            {
-                result.add(iter->first, EffectParam() - iter->second);
-            }
-        }
-
-        return result;
-    }
-
     void MagicEffects::writeState(ESM::MagicEffects& state) const
     {
         for (const auto& [key, params] : mCollection)
diff --git a/apps/openmw/mwmechanics/magiceffects.hpp b/apps/openmw/mwmechanics/magiceffects.hpp
index 4fe5d9fd4e..80b858644e 100644
--- a/apps/openmw/mwmechanics/magiceffects.hpp
+++ b/apps/openmw/mwmechanics/magiceffects.hpp
@@ -103,19 +103,12 @@ namespace MWMechanics
         void writeState(ESM::MagicEffects& state) const;
 
         void add(const EffectKey& key, const EffectParam& param);
-        void remove(const EffectKey& key);
 
         void modifyBase(const EffectKey& key, int diff);
 
-        /// Copy Modifier values from \a effects, but keep original mBase values.
-        void setModifiers(const MagicEffects& effects);
-
         EffectParam getOrDefault(const EffectKey& key) const;
         std::optional<EffectParam> get(const EffectKey& key) const;
         ///< This function can safely be used for keys that are not present.
-
-        static MagicEffects diff(const MagicEffects& prev, const MagicEffects& now);
-        ///< Return changes from \a prev to \a now.
     };
 
     std::string getMagicEffectString(