Now and then I have walked into a room and found there are 4 or 5 large golden tentacle monsters. They run away from me right away. Is there some kind of reward for killing all of them or something? I have never been able to destroy them all.
I think these are just like a bonus enemy or something. Shoot the hell out of them and they will drop loads of obolites. I have never killed them all so I am not sure if there is a bonus for getting them all.