RG Live WotLK 3.3.5a

/ mods at aura apply or remove
    switch (GetSpellInfo()->SpellFamilyName)
    {
        case SPELLFAMILY_DRUID:
            // Enrage
            if ((GetSpellInfo()->SpellFamilyFlags[0] & 0x80000) && GetSpellInfo()->SpellIconID == 961)
            {
                if (target->HasAura(70726)) // Item - Druid T10 Feral 4P Bonus
                {
                    if (apply)
                        target->CastSpell(target, 70725, true);
                }
                else if (AuraEffect* effect = target->GetAuraEffect(SPELL_AURA_MOD_BASE_RESISTANCE_PCT, SPELLFAMILY_DRUID, 0x0, 0x0, 0x2))
                {
                    uint32 change = 0;
                    switch (effect->GetId())
                    {
                        case 1178: // bear
                            change = 27;
                            break;
                        case 9635: // dire bear
                            change = 16;
                            break;
                    }

                    int32 amount = effect->GetAmount();

                    if (apply)
                        amount = amount * (100 - change) / 100;
                    else
                        amount = amount * 100 / (100 - change) + 1; // +1 needed due to float to int turncation
                    effect->ChangeAmount(amount);
                }
                break;
            }
            break;

der code dazu ist zumindest noch live