Abyss is a game of development, combination and collection in which players try to take control of strategic locations in an underwater city. To achieve this, players must develop on three levels: first by collecting allies, then using them to recruit Lords of the Abyss, who will then grant access to different parts of the city. Players acquire cards through a draft of sorts, and the Lords of the Abyss acquired on those cards grant special powers to the cardholder — but once you use the cards to acquire a location, that power is shut off, so players need to time their land grabs well in order to put themselves in the best position for when the game ends.