Some misc cleansup.

Source/Game/Spells/Auras/Aura.cs

@@ -1696,7 +1696,7 @@ namespace Game.Spells
 
             // check spell triggering us
             Spell spell = eventInfo.GetProcSpell();
-            if (spell)
+            if (spell != null)
             {
                 // Do not allow auras to proc from effect triggered from itself
                 if (spell.IsTriggeredByAura(m_spellInfo))

Source/Game/Spells/Auras/AuraEffect.cs

@@ -637,7 +637,7 @@ namespace Game.Spells
                     break;
                 case AuraType.ModCastingSpeedNotStack:
                     // skip melee hits and instant cast spells
-                    if (!eventInfo.GetProcSpell() || eventInfo.GetProcSpell().GetCastTime() == 0)
+                    if (eventInfo.GetProcSpell() == null || eventInfo.GetProcSpell().GetCastTime() == 0)
                         return false;
                     break;
                 case AuraType.ModSchoolMaskDamageFromCaster:
@@ -651,7 +651,7 @@ namespace Game.Spells
                 {
                     // Skip melee hits and spells with wrong school or zero cost
                     if (spellInfo == null || !Convert.ToBoolean((int)spellInfo.GetSchoolMask() & GetMiscValue()) // School Check
-                        || !eventInfo.GetProcSpell())
+                        || eventInfo.GetProcSpell() == null)
                         return false;
 
                     // Costs Check
@@ -1963,7 +1963,7 @@ namespace Game.Spells
                 for (var i = CurrentSpellTypes.Melee; i < CurrentSpellTypes.Max; ++i)
                 {
                     Spell spell = target.GetCurrentSpell(i);
-                    if (spell)
+                    if (spell != null)
                         if (spell.m_spellInfo.PreventionType.HasAnyFlag(SpellPreventionType.NoActions))
                             // Stop spells on prepare or casting state
                             target.InterruptSpell(i, false);

Source/Game/Spells/Spell.cs

@@ -106,7 +106,7 @@ namespace Game.Spells
             for (var i = 0; i < m_loadedScripts.Count; ++i)
                 m_loadedScripts[i]._Unload();
 
-            if (m_referencedFromCurrentSpell && m_selfContainer && m_selfContainer == this)
+            if (m_referencedFromCurrentSpell && m_selfContainer != null && m_selfContainer == this)
             {
                 // Clean the reference to avoid later crash.
                 // If this error is repeating, we may have to add an ASSERT to better track down how we get into this case.
@@ -2722,13 +2722,13 @@ namespace Game.Spells
             if (modOwner)
             {
                 lastSpellMod = modOwner.m_spellModTakingSpell;
-                if (lastSpellMod)
+                if (lastSpellMod != null)
                     modOwner.SetSpellModTakingSpell(lastSpellMod, false);
             }
 
             _cast(skipCheck);
 
-            if (lastSpellMod)
+            if (lastSpellMod != null)
                 modOwner.SetSpellModTakingSpell(lastSpellMod, true);
         }
 
@@ -8086,11 +8086,6 @@ namespace Game.Spells
 
         public int GetTimer() { return m_timer; }
         
-        public static implicit operator bool(Spell spell)
-        {
-            return spell != null;
-        }
-        
         #region Fields
         Dictionary<SpellEffectName, SpellLogEffect> _executeLogEffects = new();
         PathGenerator m_preGeneratedPath;

Source/Game/Spells/SpellManager.cs

@@ -468,7 +468,7 @@ namespace Game.Entities
             // check power requirement
             if (procEntry.AttributesMask.HasAnyFlag(ProcAttributes.ReqPowerCost))
             {
-                if (!eventInfo.GetProcSpell())
+                if (eventInfo.GetProcSpell() == null)
                     return false;
 
                 var costs = eventInfo.GetProcSpell().GetPowerCost();