By the way, I have a problem with the holy grail myself! I play as a warrior, and now I am trying to get the holy grail to be able to transform the animals back to their old self. I have found the cave and killed the infernal guardian in the first room.
When I enter the grail room and put the grail in my inventory the "Grayface" attacks me. I release a couple of death scorpions to keep him busy and make a run for the door. But the floor seems to be electrified or something, I can barely make a couple of steps before I get killed. I am level 23. Any ideas?