2005 · ソースブック（プレイを拡張するルール／オプション）

Insanity

A dark horror rules system adds Sanity as a new character attribute. Characters test and track their mental stability as they encounter monsters, witness terrible acts, learn forbidden knowledge, and cast spells. As Sanity declines, characters may suffer confusion, dementia, and other forms of mental instability. Overcoming horrific foes and gaining experience provides new powers, but continued exposure to supernatural threats can lead to permanent insanity.