Core: Use new SpellInfo class in core. Sadly, this commit is not compatibile with some of the custom code. To make your code work again you may need to change:

*SpellEntry is now SpellInfo
*GetSpellProto is now GetSpellInfo
*SpellEntry::Effect*[effIndex] is now avalible under SpellInfo.Effects[effIndex].*
*sSpellStore.LookupEntry is no longer valid, use sSpellMgr->GetSpellInfo()
*SpellFunctions from SpellMgr.h like DoSpellStuff(spellId) are now: spellInfo->DoStuff()
*SpellMgr::CalculateEffectValue and similar functions are now avalible in SpellEffectInfo class.
*GET_SPELL macro is removed, code which used it is moved to SpellMgr::LoadDbcDataCorrections
*code which affected dbc data in SpellMgr::LoadSpellCustomAttr is now moved to LoadDbcDataCorrections

src/server/scripts/Spells/spell_priest.cpp

@@ -46,14 +46,14 @@ class spell_pri_guardian_spirit : public SpellScriptLoader
 
             uint32 healPct;
 
-            bool Validate(SpellEntry const* /*spellEntry*/)
+            bool Validate(SpellInfo const* /*spellEntry*/)
             {
-                return sSpellStore.LookupEntry(PRIEST_SPELL_GUARDIAN_SPIRIT_HEAL) != NULL;
+                return sSpellMgr->GetSpellInfo(PRIEST_SPELL_GUARDIAN_SPIRIT_HEAL) != NULL;
             }
 
             bool Load()
             {
-                healPct = SpellMgr::CalculateSpellEffectAmount(GetSpellProto(), EFFECT_1);
+                healPct = GetSpellInfo()->Effects[EFFECT_1].CalcValue();
                 return true;
             }
 
@@ -184,9 +184,9 @@ class spell_pri_penance : public SpellScriptLoader
         {
             PrepareSpellScript(spell_pri_penance_SpellScript);
 
-            bool Validate(SpellEntry const* spellEntry)
+            bool Validate(SpellInfo const* spellEntry)
             {
-                if (!sSpellStore.LookupEntry(PRIEST_SPELL_PENANCE_R1))
+                if (!sSpellMgr->GetSpellInfo(PRIEST_SPELL_PENANCE_R1))
                     return false;
                 // can't use other spell than this penance due to spell_ranks dependency
                 if (sSpellMgr->GetFirstSpellInChain(PRIEST_SPELL_PENANCE_R1) != sSpellMgr->GetFirstSpellInChain(spellEntry->Id))
@@ -240,9 +240,9 @@ class spell_pri_reflective_shield_trigger : public SpellScriptLoader
         {
             PrepareAuraScript(spell_pri_reflective_shield_trigger_AuraScript);
 
-            bool Validate(SpellEntry const* /*spellEntry*/)
+            bool Validate(SpellInfo const* /*spellEntry*/)
             {
-                return sSpellStore.LookupEntry(PRIEST_SPELL_REFLECTIVE_SHIELD_TRIGGERED) && sSpellStore.LookupEntry(PRIEST_SPELL_REFLECTIVE_SHIELD_R1);
+                return sSpellMgr->GetSpellInfo(PRIEST_SPELL_REFLECTIVE_SHIELD_TRIGGERED) && sSpellMgr->GetSpellInfo(PRIEST_SPELL_REFLECTIVE_SHIELD_R1);
             }
 
             void Trigger(AuraEffect * aurEff, DamageInfo & dmgInfo, uint32 & absorbAmount)