The Mound: Omen of Cthulhu has released a free major Halloween update, titled The Cult of Tsathoggua, introducing a new quest, area, loot and more.
Tsathoggua’s Lair
A new quest has been introduced, which can be received from a prisoner on the Galleon once all southern regions have been unlocked. He’ll send players to find the Shrine of Tsathoggua, which will require Eyes of Tsathoggua to be found within Treasure Hunt missions.
Once this is done, it’ll unlock Tsathoggua’s Lair, where players will find themselves face to face with the colossal entity. It is immune to normal weapons but once defeated, it’ll drop the Eye of Servitude – a powerful new occult relic that can turn monsters against each other. There are also a couple of new enemies to go alongside this boss, including the Frog-Fishman and more tentacle threats.
New Weapons and Cursed Treasure
Two other new weapons have made their way into The Mound, alongside the above Eye of Servitude:
- Swivel Breach Flintlock: an upgraded version that is capable of firing two shots before reloading.
- Hand Grenade: self-explanatory and available from the shop.

There are also new Cursed Treasures. These are valuable items that come with dangerous debuffs, such as reducing max HP by 50% or turning nearby trees hostile. They can be sold on the Galleon and act as a risk-reward system.
Progression Overhaul
The last main addition is an overhaul to the progression system for The Mound: Omen of Cthulhu, with a new skill tree and the maximum rank increased to 70. One skill point is earned each rank, which can be spent on board the Galleon and reset at any time. There are a few new perks, such as one that allows players to carry bodies without losing speed or one that means enemies can no longer evade backstabs.
A few smaller additions are included too, so it’s worth checking out the full update page for the complete list.
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