Larian Studios Forums Divinity: Original Sin 2 Divinity - Original Sin 2 - General [Spoilers] Help with the final act

So I'm right before the endgame, and I'm confused as to how I can get Tarquin to finish Anathema. He says it's "almost done" but I imagine there's something I need to do to trigger it.

Also, I'm baffled as to how to get the bed to raise up in the Groom's house to access the basement.

Any help is appreciated.