Tiny Epic Defenders: Kickstarter Mini-Expansion

The Kickstarter Limited Exclusive Mini-Expansion is contained in the box of the Deluxe edition for Kickstarter backers, but may also be available separately in the future. From the Kickstarter page,

Kickstarter Limited Exclusive - VERY limited quantity printed. Will never enter regular distribution channels but may become available via contests, conventions, and/or the BGG store.

It introduces 11 cards not found in the Base edition:

Giant Snake (Dire Enemy)

Basilisk (Dire Enemy)

Fire Elemental (Epic Foe)

Overlord (Epic Foe)

Baal's Bait (Artifact)

Gavel of Gamelyn (Artifact)

Necromancer (Hero)

Assassin (Hero)

Avenger (Legendary Hero #1)

Revenant (Legendary Hero #2)

Guardian (Legendary Hero #3)