I believe this may be a dead event or it could just be bugged. I attempted to kill it the other day and everything started according to plan. I killed the first lizard, the three others spawned and blew up... The avatar popped and started doing circles while 50,000 PoFear mobs spawned on top of me and agroed. However, I got to a certain point where I was killing all the mobs and boom, the AoF just poofs into thin air as well as the chick that spawned in the event also. I searched tracking and everything, and there was no sign of any of the mobs. I am wondering if you need to actually hand in those rune looking things that heal your party to keep the event going... I've been waiting for the spawn to pop so I could test this theory but someone else always gets there before me.
i dont know much about the ring of fear, but i do know ring of slime, and this mob isnt a ring of slime mob, its a boss mob from ring of fear, one of the mini wave bosses