Like many things, the Sooth Deck serves multiple purposes in Invisible Sun. As a part of the setting, the Sooth Deck is a 60-card set of divinatory cards played upon a board showing the Path of Suns. Each card briefly brushes across a strand of fate to learn what might be in store for the person in question. Each deck is divided into four families, and each family has royalty cards. The Sooth Deck is also something that a character might have and use within the context of the game.