Erizon
Akilia Ash Storm seemed to be controlled by an Event Manager, but we've also had invasions where the boss is an AI-controlled mob, like the Kitin Swarmheader, that followed the same principle of having a gazillion health but only a ~3000 damage melee attack. So once all the minions are down, it takes 5-20 minutes to kill the boss, but the boss hardly kills a single player during that time - except the two tanks who are expected to die so their deaths only add to the feeling that the players are in total control.This seems more intended for the player-controlled Event Bosses, like Akilia Ash Storm
Principle is the same for both. Though EM-controlled bosses can at least use their human intelligence to go for the healers ^^