Jerome Moreau’s Prison

You appear in Mont Crane Cave (an unmarked Monster Den north of the castle). As one of the books you just found is related to golems, it shouldn’t come as a surprise that Moreau’s lumbering familiar is still guarding this underground area. Fortunately, it is as slow-moving as it is strong. Defeat it in glorious combat (the Bestiary has some Golem-slaying plans), before pushing further up into the prison, away from the portal.

There’s much to discover here; a tiny chest on a shelf, close to the large stone fireplace and oven, contains a diagram. There’s another diagram just sitting out on a small table by two large copper brewing stills (there’s a note made by Jerome on the back of this diagram; a letter to his father Professor Moreau, that is distinctly the opposite of an affectionate missive). On a chair is a small sack containing a shirt and the final diagram.

This concludes the quest for the Grandmaster diagrams, but you still need to leave this cave. Interact with the rock wall to the left of the fireplace; it is an illusion, allowing you to reveal a separate section of cave, where you can loot some choice chests, drop into a pool of water, and escape back into Toussaint via a cave mouth north of Mont Crane Castle, in an area east of Basane Farm. Beware of Fleders and a Garkain lurking in this Monster Den.