Atlus will be spoiling those who pre-order Knights in the Nightmare with a bonus art book. This 96-page, full-color art book, dubbed the Tome of Lost Souls, will feature the works of designers and illustrators Shinichi Ito, Satoko Kiyuduki, Yoshinori Iwanaga, and Sunaho Tobe. Atlus has made a sampling of the Tome available online for a preview of the game's art style.

Purchasers of Knights will also receive the game's soundtrack CD, featuring 38 tracks and one bonus song not available anywhere else. Knights in the Nightmare will be released on June 2, 2009, with an MSRP of $34.99. RPGamer's impression of the title is available here.