uint32 Unit::SpellCriticalDamageBonus(SpellEntry const *spellProto, uint32 damage, Unit* victim)
    {
        // Calculate critical bonus
        int32 crit_bonus = 0;
        float crit_mod = 0.0f;

        switch(spellProto->DmgClass)
        {
            case SPELL_DAMAGE_CLASS_MELEE:                      // for melee based spells is 100%
            case SPELL_DAMAGE_CLASS_RANGED:
                crit_bonus = damage;
                break;
            default:
                crit_bonus = damage / 2;                        // for spells is 50%
                break;
        }

        // adds additional damage to crit_bonus (from talents)
        if (Player* modOwner = GetSpellModOwner())
            modOwner->ApplySpellMod(spellProto->Id, SPELLMOD_CRIT_DAMAGE_BONUS, crit_bonus);

        crit_mod_meta += (GetTotalAuraMultiplierByMiscMask(SPELL_AURA_MOD_CRIT_DAMAGE_BONUS, spellProto->SchoolMask));

        if (victim)
        {
            uint32 creatureTypeMask = victim->GetCreatureTypeMask();
            crit_mod += GetTotalAuraMultiplierByMiscMask(SPELL_AURA_MOD_CRIT_PERCENT_VERSUS, creatureTypeMask);

            switch (spellProto->DmgClass)
            {
                case SPELL_DAMAGE_CLASS_MELEE:
                    crit_mod += (victim->GetTotalAuraMultiplier(SPELL_AURA_MOD_ATTACKER_MELEE_CRIT_DAMAGE));
                    break;
                case SPELL_DAMAGE_CLASS_RANGED:
                    crit_mod += (victim->GetTotalAuraMultiplier(SPELL_AURA_MOD_ATTACKER_RANGED_CRIT_DAMAGE) -1.0f) * 100;
                    break;
                default:
                    crit_mod += (victim->GetTotalAuraMultiplier(SPELL_AURA_MOD_SCHOOL_CRIT_DMG_TAKEN) -1.0f) * 100;
                    break;
            }
        }

        if (crit_bonus != 0)
        {
            crit_bonus = (int32)((((crit_mod_meta * 2) - 1) * crit_mod)  + crit_bonus);
            damage += crit_bonus;
        }

        // Resilience - reduce crit damage
        if (victim)
            damage -= victim->GetResilienceDamageReduction(damage, CR_CRIT_TAKEN_SPELL, true);

        return damage;
    }