Originally Posted by
Odd
That particular boss waits outside of the sealed barrier until you kill all the right mobs first. I think it's the monkeys. I know I saw this happen when I had a party skip the first set of 3 mobs. I told them we had to kill them, they said no we don't. Then when we killed the two monkey's on the bridge, the gorilla stayed outside, he didn't run in like he normally does. He was invulnerable to our attacks, but would attack us if we approached him. Went to the start and killed the first pack, then when we got back to the boss he was where he should be, waiting to fight us.