Fiends & Fortresses

A book found in Wave Echo Cave, in Mormesk's Library. Darien picked the book of the shelf at random.

It is a role playing game, where a narrator called the Fortress Master lets tells a collaborative fictional story. Darien now wants to learn and teach his adventuring partners to play.

Carp and Pip played a game of make belief in Phandalin that sounded very similar to Fiends & Fortresses. Maybe they can play as well?