void Spell::SpellEffectApplyAura(uint32 i)  // Apply Aura
{
    if( unitTarget == NULL )
        return;
    // can't apply stuns/fear/polymorph/root etc on boss
    if( unitTarget->IsCreature() )
    {
        if( u_caster != NULL && ( u_caster != unitTarget ) )
        {
            Creature * c = TO< Creature* >( unitTarget );
            /*
            Charm (Mind Control, enslave demon): 1
            Confuse (Blind etc): 2
            Fear: 4
            Root: 8
            Silence : 16
            Stun: 32
            Sheep: 64
            Banish: 128
            Sap: 256
            Frozen : 512
            Ensnared 1024
            Sleep 2048
            Taunt (aura): 4096
            Decrease Speed (Hamstring) (aura): 8192
            Spell Haste (Curse of Tongues) (aura): 16384
            Interrupt Cast: 32768
            Mod Healing % (Mortal Strike) (aura): 65536
            Total Stats % (Vindication) (aura): 131072
            */

            //Spells with Mechanic also add other ugly auras, but if the main aura is the effect --> immune to whole spell
            if (c->GetProto()->modImmunities)
            {
                bool immune = false;
                if (m_spellInfo->MechanicsType)
                {
                    switch(m_spellInfo->MechanicsType)
                    {
                    case MECHANIC_CHARMED:
                        if (c->GetProto()->modImmunities & 1)
                            immune = true;
                        break;
                    case MECHANIC_DISORIENTED:
                        if (c->GetProto()->modImmunities & 2)
                            immune = true;
                        break;
                    case MECHANIC_FLEEING:
                        if (c->GetProto()->modImmunities & 4)
                            immune = true;
                        break;
                    case MECHANIC_ROOTED:
                        if (c->GetProto()->modImmunities & 8)
                            immune = true;
                        break;
                    case MECHANIC_SILENCED:
                        if ( c->GetProto()->modImmunities & 16)
                            immune = true;
                        break;
                    case MECHANIC_STUNNED:
                        if (c->GetProto()->modImmunities & 32)
                            immune = true;
                        break;
                    case MECHANIC_POLYMORPHED:
                        if (c->GetProto()->modImmunities & 64)
                            immune = true;
                        break;
                    case MECHANIC_BANISHED:
                        if (c->GetProto()->modImmunities & 128)
                            immune = true;
                        break;
                    case MECHANIC_SAPPED:
                        if (c->GetProto()->modImmunities & 256)
                            immune = true;
                        break;
                    case MECHANIC_FROZEN:
                        if (c->GetProto()->modImmunities & 512)
                            immune = true;
                        break;
                    case MECHANIC_ENSNARED:
                        if (c->GetProto()->modImmunities & 1024)
                            immune = true;
                        break;
                    case MECHANIC_ASLEEP:
                        if (c->GetProto()->modImmunities & 2048)
                            immune = true;
                        break;
                    }
                }
                if (!immune)
                {
                    // Spells that do more than just one thing (damage and the effect) don't have a mechanic and we should only cancel the aura to be placed
                    switch (m_spellInfo->EffectApplyAuraName[i])
                    {
                    case SPELL_AURA_MOD_CONFUSE:
                        if (c->GetProto()->modImmunities & 2)
                            immune = true;
                        break;
                    case SPELL_AURA_MOD_FEAR:
                        if (c->GetProto()->modImmunities & 4)
                            immune = true;
                        break;
                    case SPELL_AURA_MOD_TAUNT:
                        if (c->GetProto()->modImmunities & 4096)
                            immune = true;
                        break;
                    case SPELL_AURA_MOD_STUN:
                        if (c->GetProto()->modImmunities & 32)
                            immune = true;
                        break;
                    case SPELL_AURA_MOD_SILENCE:
                        if ((c->GetProto()->modImmunities & 32768) || (c->GetProto()->modImmunities & 16))
                            immune = true;
                        break;
                    case SPELL_AURA_MOD_DECREASE_SPEED:
                        if (c->GetProto()->modImmunities & 8192)
                            immune = true;
                        break;
                    case SPELL_AURA_INCREASE_CASTING_TIME_PCT:
                        if (c->GetProto()->modImmunities & 16384)
                            immune = true;
                        break;
                    case SPELL_AURA_MOD_LANGUAGE: //hacky way to prefer that the COT icon is set to mob
                        if (c->GetProto()->modImmunities & 16384)
                            immune = true;
                        break;
                    case SPELL_AURA_MOD_HEALING_DONE_PERCENT:
                        if (c->GetProto()->modImmunities & 65536)
                            immune = true;
                        break;
                    case SPELL_AURA_MOD_TOTAL_STAT_PERCENTAGE:
                        if (c->GetProto()->modImmunities & 131072)
                            immune = true;
                        break;
                    }
                }
                if( immune )
                    return;
            }
        }
    }

#ifdef GM_Z_DEBUG_DIRECTLY
    else {
        if( unitTarget->IsPlayer() && unitTarget->IsInWorld() && TO< Player* >( unitTarget )->GetSession() && TO< Player* >( unitTarget )->GetSession()->CanUseCommand('z')  ) {
            sChatHandler.BlueSystemMessage( TO< Player* >( unitTarget  )->GetSession(), "[%sSystem%s] |rSpell::SpellEffectApplyAura: %s EffectApplyAuraName [%u] .", MSG_COLOR_WHITE, MSG_COLOR_LIGHTBLUE, MSG_COLOR_SUBWHITE,
                i );
        }
    }
#endif

    // avoid map corruption.
    if(unitTarget->GetInstanceID() != m_caster->GetInstanceID())
        return;

    //check if we already have stronger aura
    Aura *pAura;

    std::map<uint64, Aura*>::iterator itr = m_pendingAuras.find(unitTarget->GetGUID());
    //if we do not make a check to see if the aura owner is the same as the caster then we will stack the 2 auras and they will not be visible client sided
    if(itr == m_pendingAuras.end())
    {
        if( GetProto()->NameHash == SPELL_HASH_BLOOD_FRENZY && ProcedOnSpell )//Warrior's Blood Frenzy
            GetProto()->DurationIndex = ProcedOnSpell->DurationIndex;

        uint32 Duration = GetDuration();

        // Handle diminishing returns, if it should be resisted, it'll make duration 0 here.
        if(!(GetProto()->Attributes & ATTRIBUTES_PASSIVE)) // Passive
            ::ApplyDiminishingReturnTimer(&Duration, unitTarget, GetProto());

        if(!Duration)
        {
            SendCastResult(SPELL_FAILED_IMMUNE);
            return;
        }

        if( g_caster && g_caster->GetUInt32Value(OBJECT_FIELD_CREATED_BY) && g_caster->m_summoner )
            pAura = new Aura( GetProto(), Duration, g_caster->m_summoner, unitTarget, m_triggeredSpell, i_caster );
        else
            pAura = new Aura( GetProto(), Duration, m_caster, unitTarget, m_triggeredSpell, i_caster );

        pAura->pSpellId = pSpellId; //this is required for triggered spells

        m_pendingAuras.insert(std::make_pair(unitTarget->GetGUID(), pAura));
        AddRef();
        sEventMgr.AddEvent(this, &Spell::HandleAddAura, unitTarget->GetGUID(), EVENT_SPELL_HIT, 100, 1, 0);
    }
    else
    {
        pAura = itr->second;
    }
    pAura->AddMod( GetProto()->EffectApplyAuraName[i], damage, GetProto()->EffectMiscValue[i], i );

}