Devolver Digital and Massive Monster have announced a free new expansion for their hit game, Cult of the Lamb, titled Unholy Alliance.

One of the major new features coming to the expansion, which is set to release on August 12th, is local co-op.

Among this also comes new relics, tarot cards, follower quests and traits, and buildings for players to be able to play through the game as well as a new playable character.

Here’s a rundown of the update, plus new trailer:

Unholy Alliance is the latest free update for smash hit Cult of the Lamb, introducing a new playable character: the Goat! Summoned by blood and born in corruption, this wicked new ally can join the holy Lamb in local co-op. Crusade through dungeons, slay heretics, build your cult, and seek new powers together on August 12.

Experience the entire Cult of the Lamb campaign in local co-op, with one player inhabiting the role of the Lamb and the other taking on the mantle of the Goat. Enjoy new 2-player twists on existing minigames like fishing and knucklebones, and choose from a selection of corrupted weapons, tarot cards, curses, and relics as you embark on co-op crusades.

The Lamb and the Goat can swap weapons, deal extra damage when fighting back-to-back, or deal a critical hit if their attacks are in sync. Solo players also get a heap of new powers and abilities to play with.

As well as the addition of co-op play, the Unholy Alliance expansion also adds new tarot cards, relics, buildings, fleeces, follower traits, follower quests, and other secrets to discover!

Cult of the Lamb is available for Windows PC, Mac (via GOG and Steam), Nintendo Switch, PlayStation 4, PlayStation 5, Xbox One, and Xbox Series XIS. In case you missed it – you can read our review for Cult of the Lamb right here.