So, you and the psychic are at the late ghoul-king's barracks. The area has been trashed a bit, but there's plenty of usable equipment available to you. Though, you must hurry as the slime is still chasing after you.
And last but not least, you find a spell book. Several pages seem to have been torn out, but from what's left of it you can interpret the spells barbed chains, daze monster, grease, detect magic, and arcane mark