tsunamirus

It is only used in Sunwell Radiance, so everything should be ok with this code.

Try to add this in Aura->HandleSpellSpecificBoosts

If you get a stack, and then right click to remove it, you will have visual effect forever, which isn't correct.

Try this:

            if (spellProto->SpellFamilyFlags & UI64LIT(0x800000))
           {
               // Mind Flay buffs - each depends on Shadow Word: Pain present on the target
               if (pVictim->GetAura(SPELL_AURA_PERIODIC_DAMAGE, SPELLFAMILY_PRIEST, UI64LIT(0x8000), 0, GetGUID()))
               {
                   // Twisted Faith
                   if (Aura * aur = GetAura(SPELL_AURA_OVERRIDE_CLASS_SCRIPTS, SPELLFAMILY_PRIEST, 2848, 1))
                       DoneTotalMod *= (aur->GetModifier()->m_amount+100.0f) / 100.0f;
                   // Glyph of Mind Flay
                   if (Aura *aur = GetAura(55687, EFFECT_INDEX_0))
                       DoneTotalMod *= (aur->GetModifier()->m_amount+100.0f) / 100.0f;
               }
           }

Does not work as intended, when stacks fade the effect still persist.

And it does not trigger on first stack, only on second.

This wont work because you need to remove first break.

float Unit::MeleeMissChanceCalc(const Unit *pVictim, WeaponAttackType attType) const
{
   if(!pVictim)
       return 0.0f;

   // Base misschance 5%
   float misschance = 5.0f;

   // DualWield - Melee spells and physical dmg spells - 5% , white damage 24%
   if (haveOffhandWeapon() && attType != RANGED_ATTACK)
   {
       bool isNormal = false;
       for (uint32 i = CURRENT_FIRST_NON_MELEE_SPELL; i < CURRENT_MAX_SPELL; ++i)
       {
           if( m_currentSpells[i] && (GetSpellSchoolMask(m_currentSpells[i]->m_spellInfo) & SPELL_SCHOOL_MASK_NORMAL) )
           {
               isNormal = true;
               break;
           }
       }
       if (!isNormal && !m_currentSpells[CURRENT_MELEE_SPELL])
           misschance += 19.0f;
   }

   int32 skillBonus = int32(pVictim->GetDefenseSkillValue(this)) - int32(this->GetWeaponSkillValue(attType, pVictim));

   if (abs(skillBonus) <= 10)
       misschance += skillBonus * 0.1f;
   else
       misschance += 1.0f + (skillBonus - 10) * 0.4f;

   // Hit chance from attacker based on ratings and auras
   if (attType == RANGED_ATTACK)
       misschance -= m_modRangedHitChance;
   else
       misschance  -= m_modMeleeHitChance;

   // Hit chance for victim based on ratings
   if (pVictim->GetTypeId()==TYPEID_PLAYER)
   {
       if (attType == RANGED_ATTACK)
           misschance += ((Player*)pVictim)->GetRatingBonusValue(CR_HIT_TAKEN_RANGED);
       else
           misschance += ((Player*)pVictim)->GetRatingBonusValue(CR_HIT_TAKEN_MELEE);
   }

   // Modify miss chance by victim auras
   if(attType == RANGED_ATTACK)
       misschance -= pVictim->GetTotalAuraModifier(SPELL_AURA_MOD_ATTACKER_RANGED_HIT_CHANCE);
   else
       misschance -= pVictim->GetTotalAuraModifier(SPELL_AURA_MOD_ATTACKER_MELEE_HIT_CHANCE);

   // Limit miss chance from 0 to 60%
   if ( misschance < 0.0f)
       return 0.0f;
   if ( misschance > 60.0f)
       return 60.0f;

   return misschance;
}

whole MeleeMissChanceCalc function with formula accordng to Wowwiki.