Krill

1. If you haven't found the KREBF spell, don't continue.
2. You can undo some of the damage he is causing by casting KREBF in the various rooms that have been damaged by him.
3. This is only a temporary measure, however, and somewhat of a waste of time.
4. If you haven't entered the Warlock's Tower, don't continue.
5. You must fend off the two monsters that he sets after you and then deliver the coup de grace.