Altar Quest is a cooperative game of fantasy adventure for 1–4 players. Designed by Adam and Brady Sadler, Altar Quest draws upon the success of their Modular Deck System (introduced in Street Masters and Brook City) and is based in their all-original setting inspired by high fantasy and Gothic horror.

Each player in Altar Quest chooses to play as a hero with their own unique cards and equipment. Then, players choose a quest deck to undertake, a threat deck to serve as the main enemy forces, and a sinister villain deck to face off against. Each of these decks are fixed and require no assembly (ensuring quick setup and tear down), but can be mixed and matched to create a wide variety of combinations.

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In addition to the enemies in the chosen threat deck, the danger of lurkers is always present in every quest. Lurkers are represented by a deck containing enemies from across your Altar Quest collection; you never know who you will encounter on your adventures!