[Armanthuz]

from module zone/mobai.cpp

starts at line 201

Mob* EntityList::AICheckCloseArrgo(Mob* sender, float iArrgoRange, float iAssistRange) {
	if (sender->GetPrimaryFaction() == 0)
		return 0; // well, if we dont have a faction set, we're gonna be indiff to everybody
    LinkedListIterator<Entity*> iterator(list);
	iterator.Reset();
	int8 RandRoll = rand()%100;
	float dist,distZ;
	int leveldif;
    while(iterator.MoreElements()) {
		if (iterator.GetData()->IsMob() && !iterator.GetData()->IsCorpse() && iterator.GetData() != sender) {
			Mob* mob = iterator.GetData()->CastToMob();
			FACTION_VALUE fv = FACTION_INDIFFERENT;
			fv = mob->GetFactionCon(sender);
			dist = mob->Dist(sender);
			distZ = sender->GetZ()-mob->GetZ();
			leveldif = mob->GetLevel() - sender->GetLevel();
			if (leveldif < 0){
				leveldif=0;
			}
			if (fv <= FACTION_AMIABLE
				&& mob->IsEngaged()
				&& mob->GetTarget()
				&& dist <= (iAssistRange-leveldif)
				&& (mob->GetINT() <= 100 || mob->GetTarget()->GetLevelCon(sender->GetLevel()) != CON_GREEN)
				&& sender->Dist(mob->GetTarget()) <= (iAssistRange * 2)
				) {
				return mob->GetTarget();
			}
			else if (
				!(mob->IsClient() && mob->CastToClient()->GetGM())
				&& mob->InZone()
				&& (fv == FACTION_SCOWLS || (fv == FACTION_THREATENLY && RandRoll < THREATENLY_ARRGO_CHANCE))
				&& !mob->IsInvisible() 
				&& dist <= (iArrgoRange - leveldif)
				&& (distZ > -10 && distZ < 10)
				&& (sender->GetINT() <= 75 || mob->GetLevelCon(sender->GetLevel()) != CON_GREEN)
				) {
				return mob;
			}			
		}
		iterator.Advance();
	}
	return 0;
}

I also reduced all aggroradius on mobs to 65 from 85. I feel this is a good compromise given that you cant do LOS checks and chain aggro gets silly otherwise....