The Mound – Halloween Major Update: Cult of Tsathoggua

Something stirs beneath the earth...

A mysterious prisoner, a forgotten cult, and a terrifying creature waiting in the darkness.

Our Halloween Major Update: Cult of Tsathoggua is here, bringing a brand-new quest to access a new underground map, deadly enemies, new weapons, cursed treasures, and a major progression overhaul!

Here's everything you can discover in this Major Update.

New Quest: The Shrine of Tsathoggua

A prisoner chained in the depths of the Galleon has a story to tell. And he might just lead you somewhere you wish you'd never found...

Once you've unlocked the southern regions, head to the lower deck of the Galleon and speak to the prisoner.

He'll set you on a new quest to uncover the Shrine of Tsathoggua.

How does it work?

• Find Eyes of Tsathoggua hidden inside shrines during Treasure Hunt missions.
• You can find up to one Eye per expedition.
• Collect 6 Eyes and bring them back to the Galleon to unlock a new location.
• Be careful! Eyes lost during an expedition won't count toward your progress.
• You can collect Eyes on any map and repeat expeditions as often as you like.
• Eyes collected while playing as a guest also count toward your own progression.

New Map: Tsathoggua's Lair

Deep beneath the earth, something ancient is waiting.

Explore a brand-new underground location and come face-to-face with Tsathoggua, a colossal creature immune to conventional weapons.

Your guns won't save you this time. You'll need to figure out another way to defeat it.

You'll find torches, salts, and healing supplies scattered throughout the lair to help you survive.

Defeat Tsathoggua to earn the Eye of Servitude, a powerful new occult relic.

All players who complete the mission will receive the reward, and only the host needs to have unlocked the map for everyone to join.

New Enemies

The darkness has a few new surprises waiting for you.

• Tsathoggua: A colossal entity ruling over its underground lair.
• Frog-Fishman: A new creature lurking in Tsathoggua's Lair and on selected maps near the Mound.
• New Tentacles: Watch out for new tentacle threats during Portal Contracts.

New Weapons & Occult Relic

A few new tools might help you survive your next expedition.

• Swivel Breech Flintlock: An upgraded flintlock capable of firing two shots before reloading.
• Hand Grenade: A new explosive weapon available directly from the shop.
• Eye of Servitude: A new occult relic that lets you turn monsters against their own kind. Hold it up to an enemy and watch the chaos unfold!

Cursed Treasures

Some treasures are better left untouched.

We've introduced Cursed Treasures, valuable-looking items that come with a dangerous twist.

You'll recognize them by a red flash in your inventory, a distinctive sound, and an on-screen warning.

Each cursed treasure carries a specific effect that targets whoever is holding it.

• Screaming Idol: Makes noise while you carry it. Good luck staying unnoticed.
• The Trees Will Listen: Nearby trees turn hostile and attack you with their branches.
• Mi-Go's Beacon: Attracts a Mi-Go to your location. Keep holding it, and another might join the party.
• Blood Price: Reduces your maximum HP by 50%.

Will you risk carrying one back to the Galleon?

Progression Overhaul: Rank 70 & New Skill Tree

Your adventures can now take you even further!

We've increased the maximum rank to 70 and reworked the progression system with a brand-new skill tree.

Here's how the new system works:

• Earn 1 skill point per rank.
• Spend your points at the statue aboard the Galleon.
• Choose one perk per row to customize your character.
• Reset your skill tree at any time to recover all spent points.
• Bonus inventory slots remain free and don't require skill points.

Important: Perks unlock immediately when selected, without a confirmation prompt.

New Perks

Perk

Effect

Carry Strength

Carry bodies without losing movement speed and pick up objects faster.

Stamina Bonus (2 tiers)

Increase stamina to 125%, then 150%.

Improved Night Vision

Gain a faint glow that reveals your immediate surroundings in darkness.

Bleed Resistance (2 tiers)

Reduce the duration of bleeding effects.

Red Dust Immunity

Become immune to worm parasites caused by breathing red dust.

Pious

Start each expedition with a crucifix.

Bomber-man

Start each expedition with a bomb.

First Kit

Start each expedition with salts.

Backstab Specialist

Enemies can no longer evade your backstabs.

Map-Savvy

Reveal potential item locations on your map.

Dread Damage Resistance

Reduce dread damage received from enemies.

Armor Specialist

Run silently while wearing armor.

Knife Specialist

Your knife never breaks.

Experiment with different perks to find the combination that best suits your playstyle!

Even more Sanity Hallucinations

Can you still trust what you see?

We've extended one of the most loved sanity effects to new items.

Your mind might be playing tricks on you in ways you haven't experienced before.

And the best part? Your teammates might see things very differently...

Halloween Atmosphere & New Outfits

Halloween has arrived aboard the Galleon!

• Halloween Decorations: The Galleon has received a spooky seasonal makeover.
• Cultist Outfits DLC: Four new cultist outfits, one for each main character, are now available as a paid DLC. Once purchased, you can equip them from the character selection screen.

Fixes & Improvements

Alongside all the new content, we've also made a few fixes and technical improvements.

• Cursed Jar: Black Ichor now correctly enrages and attracts all monster types.
• Swivel Breech Flintlock: Fixed a visual issue causing a gunpowder element to appear incorrectly during certain carrying animations.
• Shader Optimizations: Improved shaders for better performance. Please note that shader compilation may take slightly longer on the first launch after updating on PC.

See You in the Darkness!

That's everything coming with Cult of Tsathoggua!

Whether you're hunting down Eyes of Tsathoggua, experimenting with the new skill tree, or discovering just how dangerous cursed treasures can be, we hope you enjoy everything this Major Update has to offer.

As always, thank you for your support and feedback. Keep sharing your adventures with us!

Happy Halloween, Explorers!

The Mound Team