The Mournmere Survey | A 5e One-Shot Adventure for Small Groups | Horror, Levels 2-3, Ready to Run

A drowned village. Five failing wards. And something beneath the water that has waited forty years to be answered.

The Mournmere Survey is a complete, ready-to-run horror one-shot for fifth edition, built for small groups of 2-3 players at levels 2-3 and a single evening of play. Your party is hired to chart a quiet mountain reservoir — until they find the abandoned camp of the crew who came before them, the wards that keep something bound, and the truth of the village that lies drowned beneath the still grey water. Everything a Game Master needs to run the full session is here, and no prep is required.

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Forty years ago the valley of Vethryn was flooded to make the reservoir, and its dead were left unmoved beneath the rising water. One of them has never stopped grieving. As the wards fail one by one, the lake begins to wake — and the only way out is to understand what was buried below, and to choose how it should finally be laid to rest.

This is slow-burn, atmospheric horror in the vein of a haunted-water ghost story: quiet dread that builds to a desperate midnight stand on the last dry ground. Every act has its own threat and its own discovery, the danger escalates on a clock the players can see, and the ending they reach depends on what they are willing to do for a stranger who has been dead for forty years.

What's Inside:

• A complete four-act horror adventure, roughly 80 pages, playable in a single 2-3 hour session
• Tuned for 2-3 players at levels 2-3, with built-in scaling for a party of two
• Nine ready-to-use stat blocks, from the drowned dead to a towering grief-built guardian of stone and coffins
• Five battle maps, including a full regional map of the valley so you can see how every location connects at a glance
• Four pregenerated characters, each with tactics notes and a personal stake in the story
• A signature cinematic drowning mechanic, a failing-ward doom clock, and three distinct endings
• Opening hooks, "what if" contingency guidance, a full aftermath, and threads to carry the story onward

## Why This One-Shot:

• Genuinely ready to run — read-aloud boxed text, scaling, and Game Master notes are built into every scene
• Designed for small tables, two-player duets, and one-on-one play, not sprawling six-person parties
• Combat in every act, but the real tension is the mystery, the rising water, and the choice at the end
• A self-contained story you can drop into any fifth edition campaign, or run as a stand-alone scare

Perfect For:

• Busy Game Masters who want a polished horror night without the prep grind
• A single haunting evening, a convention slot, or a one-shot break from a longer campaign
• Players who love tragic, atmospheric horror over dungeon-crawl grind
• Anyone who has ever wondered what towns lie at the bottom of the reservoir
• No prep. No filler. Open the book and run a night your table will not forget.