The Mound: Omen of Cthulhu Wiki

The Mound: Omen of Cthulhu is a four-player cooperative horror game developed by ACE Team and published by Nacon. Squads aboard the galleon Tempestad launch into a cursed sixteenth-century South American jungle warped by influences from H. P. Lovecraft's The Mound. Missions blend stealth, sanity management, and extraction pacing — roughly twenty minutes per run in preview materials — with cross-play across PC, PlayStation 5, and Xbox Series X|S.

Unlike arena shooters or pure survival sandboxes, The Mound rewards disciplined preparation and communication. Spatial voice chat means threats are heard before they are seen, and personal sanity meters spawn hallucinations that differ per player. Success means returning to the Tempestad with loot and knowledge, not clearing every enemy in the jungle.

This fan wiki at themoundomenofcthulhu.wiki documents gameplay systems, expedition guides, weapon loadouts, enemy behavior, map progression, and release details ahead of and after the July 15, 2026 launch. Content draws from Steam Next Fest June 2026 demo footage, developer streams, and pre-release trailers — we label uncertain values and refresh after patches.

Four pillars define every expedition: personal sanity with per-player hallucinations, cooperative gear roles, contract-driven objectives, and extraction discipline under timer pressure. Weakness in one pillar collapses the others — musket spam attracts predators while madness splits callouts during boat rushes.

Deep dives live on dedicated pages: Sanity Mechanics covers triggers, recovery, and co-op implications; Co-op and Voice Chat explains squad roles and spatial audio etiquette; Contracts shapes objectives and payout; and Extraction Loop details the twenty-minute mission rhythm from galleon prep to boat escape.

Start with the Gameplay Overview for a full systems map before your first Tempestad launch. Preview documentation may change before launch — we track demo-sourced values and update after ACE Team balance patches.

Written guides complement raw mechanics pages with squad-tested tactics. New explorers should begin with How to Prepare Your First Expedition — role assignment, consumable checklist, and coastal insertion tips before you accept your first contract.

Sanity is the hidden killer: How the Sanity System Works teaches callout thresholds and stabilization timing. Veteran squads rely on Co-op Survival and Extraction for revive discipline and boat-rush coordination. Combat doctrine lives in Weapons, Noise, and Combat, while Beginner Tips collects quick wins from demo playthroughs.

Browse the full Guides hub for walkthroughs updated through launch week and beyond.

Expedition gear is scarce and shared. Four players must split musket authority, crossbow scouting, sword melee, oil lamp illumination, and reviving salt without duplication. Noise from firearms attracts jungle predators — the weapon triangle of crossbow stealth, sword rushdown, and limited musket use defines combat pacing.

Reference pages cover every category: Melee Weapons for parry windows and sword doctrine; Ranged Weapons for musket and crossbow timing; Items and Consumables for salt, lamps, and expedition supplies; and the community Loadout Tier List for meta rankings after launch datamining.

Visit the Weapons & Items hub for overview articles linking loadout theory to contract types and map zones.

Threats split into tangible jungle creatures — predators, parasites, colonial patrols, and eldritch hybrids — and intangible sanity hallucinations unique to each explorer. Creatures respond to noise and movement; hallucinations ignore noise logic but can cause real friendly fire if teams fail to verify callouts.

Bestiary pages document behavior and counters: Jungle Creatures lists predators and fort patrols from preview footage; Sanity Hallucinations catalogs per-player phantom types; and Combat Strategies ties enemy knowledge to musket approval doctrine and squad positioning.

The Enemies hub connects threat profiles to sanity mechanics and co-op survival guides for end-to-end expedition planning.

The cursed jungle spans coastal tutorial areas, river valleys, Spanish colonial forts, and Mound-adjacent endgame regions. Fort logbooks unlock deeper insertion points — shorter travel but higher enemy density and sanity pressure. Map knowledge separates demo wipes from successful extractions.

Zone guides cover the full progression arc: Jungle Zones describes biome layout and traversal hazards; Forts and Logbooks explains unlock trees and palisade tactics; and The Mound Endgame previews the deepest, most Lovecraftian contract routes.

Start at the Map & Forts hub for overview articles linking geography to contract selection and loadout preparation.

Cross-play across PC, PlayStation 5, and Xbox Series X|S demands platform-specific binding knowledge before day-one sessions. Spatial voice chat sensitivity, aim assist toggles, and graphics settings that preserve jungle visibility without crushing frame rate all affect expedition survival.

Platform pages cover defaults and recommendations: PC Keyboard and Mouse for keybinds and mouse sensitivity; Gamepad for controller layouts on console and PC; and Best Settings for audio, video, and accessibility options tuned to horror visibility.

The Controls hub links binding guides to system requirements and cross-play notes for mixed-platform squads.

Narrative framing aboard the galleon Tempestad adds flavor to voice sessions through distinct explorer personalities tied to Lovecraftian colonial expedition lore. Characters provide context for contracts, banter, and lore discovery — though every player shares the same gear constraints regardless of roleplay choice.

The Characters page catalogs known expedition members, voice actor details where confirmed, and lore connections to H. P. Lovecraft's The Mound. Character knowledge complements co-op guides but does not replace loadout discipline or sanity callout protocols.

Expect post-launch updates as ACE Team reveals additional crew members and narrative beats through patches and seasonal content.

Beyond written guides, this wiki hosts interactive utilities for squad preparation: role assignment across four player slots, sanity tier lookup, and shareable loadout summaries for Discord voice sessions. Tools complement static articles and connect to launch datamining for patch-tagged balance numbers.

The Loadout Planner will prevent duplicate musket claims and highlight missing lamp coverage before contracts. The Sanity Reference will catalog tier effects and hallucination archetypes with filterable tables. Browse the Tools hub for launch announcements and demo-era workarounds using static guides.

Tool outputs are fan wiki utilities, not official ACE Team or Nacon products — confirm critical decisions in-game after balance updates.

The Mound: Omen of Cthulhu launches July 15, 2026 on PC, PlayStation 5, and Xbox Series X|S with cross-play and spatial voice chat. A Steam Next Fest demo ran in June 2026, giving players hands-on time with coastal contracts, sanity systems, and Tempestad preparation loops.

Release pages cover everything needed for day one: Release Date and Platforms for storefront links and edition details; Demo Guide for Steam Next Fest content and save transfer notes; and System Requirements for minimum and recommended PC specs alongside console performance expectations.

Visit the Release Info hub for pre-order updates, patch notes, and post-launch content announcements from Nacon and ACE Team.