void Player::KillCreditGO(uint32 entry, ObjectGuid guid)
{
    uint16 addCastCount = 1;
    for (uint8 i = 0; i < MAX_QUEST_LOG_SIZE; ++i)
    {
        uint32 questid = GetQuestSlotQuestId(i);
        if (!questid)
            continue;

        Quest const* qInfo = sObjectMgr->GetQuestTemplate(questid);
        if (!qInfo)
            continue;

        QuestStatusData& q_status = m_QuestStatus[questid];

        if (q_status.Status == QUEST_STATUS_INCOMPLETE)
        {
            if (qInfo->HasSpecialFlag(QUEST_SPECIAL_FLAGS_CAST) /*&& !qInfo->HasSpecialFlag(QUEST_SPECIAL_FLAGS_KILL)*/)
            {
                for (uint8 j = 0; j < QUEST_OBJECTIVES_COUNT; ++j)
                {
                    uint32 reqTarget = 0;

                    // GO activate objective
                    if (qInfo->RequiredNpcOrGo[j] < 0)
                        // checked at quest_template loading
                        reqTarget = - qInfo->RequiredNpcOrGo[j];

                    // other not this creature/GO related objectives
                    if (reqTarget != entry)
                        continue;

                    uint32 reqCastCount = qInfo->RequiredNpcOrGoCount[j];
                    uint16 curCastCount = q_status.CreatureOrGOCount[j];
                    if (curCastCount < reqCastCount)
                    {
                        q_status.CreatureOrGOCount[j] = curCastCount + addCastCount;

                        m_QuestStatusSave[questid] = QUEST_DEFAULT_SAVE_TYPE;

                        SendQuestUpdateAddCreatureOrGo(qInfo, guid, j, curCastCount, addCastCount);
                    }

                    if (CanCompleteQuest(questid))
                        CompleteQuest(questid);

                    // same objective target can be in many active quests, but not in 2 objectives for single quest (code optimization).
                    break;
                }
            }
        }
    }
}