Beneath: Player's Handbook 2.0

From publisher blurb:

This guide lists weapons, has an index of CragLee, illustrates and explains enemies from The Inverted Church, and has a 50 page side quest full of loot and insane NPCs. The random dungeon generator on the back of the book mimics the Dungeon Dealer card system. This is a key mechanic in the side quest. All maps match 24"x30" dry erase mats and/or the Dungeon Dealer tiles/walls. The side quest, Siblings of the Sea, is a brutal crypt crawl where you'll meet Heinrich, the Bastard Giant and Val, the Necrophile. Horror and treasure awaits.