A set of 14 cards designed for the digital port of Boss Monster, and offered as a physical bonus during the Kickstarter. Comprised of:

Epic Hero - The Princess
Boss - Greg
Boss - Explodo
Boss - Chase

and two apiece of:

Spell - Fireball
Trap Room - Elder Portal
Trap Room - The Clock Tower
Monster Room - Hydra's Mire
Monster Room - Spellslime Incubator