Hey, i just killed the big worm in maggot lair 3 with fissure while he was fire immune. Someone has an explanation ?

Hey guys,

I would like to do a race this saturday around 3 pm UTC. Assassin Hardcore Hell P1. I don't really know how to organize that but i already ask some people and they were okay for doing the race. So i post that right there (dunno if it's the right place)