Originally Revealed in Kickstarter in October 2015, Spirit Island Funded quickly and surpassed goals, reaching a total of $84k. It was released in July 2017, and sold out quickly. There have been multiple printings since then.
The First Expansion. New content includes additional Scenarios, new Spirit Tokens (Wilds, Beasts, Disease and Strife Tokens), and Events, along with additional Spirits and an Adversary. This was released as stretch goals in the original Kickstarter in October 2015, a $60K goal for additional Spirits Effects and Events, and another $80K goal adding the two additional spirits, both of whom make use of the new tokens.
The first Promo Pack. As part for the original Kickstarter in October 2015, as $40k and $70k stretch goals, Spirits Serpent Slumbering Beneath the Island, and Heart of the Wildfire were released as Promo Spirits. They are occasionally reprinted and sold by the publisher for a limited time in special Promotional Packs.
The Second Expansion. As part of the Jagged Earth Kickstarter in October 2018 there were many new features; 8 Spirits, with another 2 as $75k and $250k stretch goals, 2 Adversaries, Isolation (a new mechanic), Badlands (a Spirit Token), 2 Island Boards, 3 Scenarios, Aspects for the 4 low complexity spirits from the Core Game, and more Power/Event/Fear Cards.
The second Promo Pack. As part of the Jagged Earth Kickstarter in October 2018, Finder of Paths Unseen was released as a Promo Spirit, with $100k - $200k stretch goals, adding: Downpour Drenches the World, 2 new Scenarios, 4 new Fear Cards, new adversary - Kingdom of Scotland, and 5 new Aspect Cards.