The Mound: Omen of Cthulhu Gets Free Halloween Update

The Mound: Omen of Cthulhu has received a free Halloween update called The Cult of Tsathoggua. Developer ACE Team and publisher Nacon released the major update on October 29 for PC, PlayStation 5 and Xbox Series X|S, adding a new quest, underground area, enemies and equipment to the cooperative horror game.

The new quest begins with a mysterious prisoner aboard the explorers’ galleon, eventually leading players toward a shrine dedicated to Tsathoggua, a monstrous deity drawn from Lovecraftian mythology. Players must first unlock the southern regions before speaking to the prisoner on the lower deck.

What’s New in The Mound: Omen of Cthulhu Update

The update revamps treasure shrines so they can trigger hazards, alert monsters or summon enemies. It also adds new weapons and occult items, introduces more sanity effects and raises the level cap to 70 with an expanded progression system. These changes affect the expedition itself rather than simply adding seasonal cosmetics.

The base game sends up to four players into a cursed jungle in search of treasure while monsters and unstable perceptions threaten the group. The new quest gives returning players another reason to head into the jungle during Halloween.

The major gameplay update is free but there is a separate Tsathoggua Cultist Skin Pack listed as paid cosmetic DLC on Steam. Browse more horror game news at TFR.

Sources: ACE Team official Steam news (October 29); Nacon/ACE Team press announcement.