Written by fantasy novelist Aaron S. Rosenberg, the Deryni Adventure Game is a role-playing game that is based in the Deryni novels created by Katherine Kurtz.

The setting closely resembles earth's medieval Period except with the inclusion of the Deryni, a race of humans with powers like mental telepathy and telekinesis.

Its design focuses more on the story and the player instead of dice throws.

[2] The Deryni Adventure Game was one of the first products to be designed around the Fudge RPG system.

[citation needed] Deryni Adventure Game also has custom dice, and a full size poster map of the Eleven Kingdoms and is the second main product of Grey Ghost Games.