Two pairs of promotional Spirits for Spirit Island, printed as part of the Kickstarter campaigns for the Core Set and Jagged Earth. Both promo sets Include two Spirit Mats and eight Unique Power cards. Periodically available from Greater Than Games and at conventions.
Promo Set 1
Heart of the Wildfire is a joyous Spirit of fire, destruction, and (maybe eventually) renewal. Mechanically, it's high-complexity, extreme-offense, and blights the land as it spreads.
Serpent Slumbering Beneath the Island is a slow-to-wake primal Spirit of the deep, deep earth. Mechanically, it's high-complexity and slow-developing with huge late-game payoffs.
Promo Set 2
Downpour Drenches the World
Finder of Paths Unseen