I'm not that familiar with the specifics of free kriegsspiel (genre? method?), but I like the idea in principal - it's a system agnosticism I can really get on board with: here is some of the world/system, now get on with it - you know or learn the genre conventions already, so explore with those in mind.
Even if you're not intending to play it yourself, this is a good exercise for getting your world-building started, and hopefully getting an imagination feedback loop going.
Beyond where the Barrow Downs tumbles down from Sweethouses - summer resort of the wealthy metropolitan, new land breaches the waters of the Great Grey Void like a raft of world-turtles.
Long stripped of danger and treasure, the Downs have not seen so many adventurers, cultists, scholars and speculators in a generation. An archipelago becoming a peninsula, the Barrowmere is a soggy environment thick with mounds and tombs - and the old stories of the Barrow Downs Companies suggests they are brimming with undiscovered treasure, occult secrets and bizarre beasts of ill-rumour.
- Crackdown on unauthorised prospectors by local authorities.
- A previously risen section partially submerges.
- A previously risen section completely submerges.
- New company attempting to muscle in on smaller claims.
- Stinking miasma clings to low-lying areas - general sickness and frayed tempers.
- Severe storm descends from out on the Great Grey Void.
Stake/Steal A Claim on this...
- Collapsed Mound.
- Abandoned Excavation.
- Abandoned Pumping Station (odds/evens site is wholly or partially flooded).
- Unexcavated Mound.
- Flooded Tomb.
- Spiral Shell Structure.
Odds/evens it's intact/ ruined.
- Fallen, buried, flooded.
- Fallen, partially buried, flooded - odds/evens.
- Fallen, accessible.
- Upright, buried, flooded.
- Upright, partially buried, flooded - odds/evens.
- Upright, accessible.
Accessible means you can get to it on foot - you still need to find a way in.
- Dead Dreamers: ancient, horrible, weird - their Dreaming can affect the Waking world.
- Mound People: exist across two dimensions simultaneously - think ours is a hallucination.
- Servants of the Orbus/ Orcus: death/demon worshipping cyclopes with shareable beholderkin eyes
- Intelligent/ Social Undead.
- Sea Creatures/ Monsters: somehow able to survive out of the depths.
- Merfolk: this isn't your claim to stake, it's their home.
Special Fish-out-of-Water Surface Encounters.
- Twitching Kraken - the size of a field; surprisingly resilient and adaptable.
- Stranded Submarine - not from round here.
- Shipwreck - ancient or modern.
- Dead/ Dying Whale - poor thing.
- The opposite of Deep-Sea Divers - adventurers/prospectors from the undersea realm.
- Burst Abyssal Leviathan - over acres; swarming with scavengers; stomach like a collapsed circus tent.
- Goldrush economics.
- Unscrupulous predators.
- Ill-prepared fortune seekers.
- Well-prepared claim jumpers.
- No justice without friends or money.
- Ineffectual or overbearing local authority.
- Cramped, insanitary conditions.
- Revived cults/gods.
- The mighty sea.
- Going too far.
- Trespass on the mythic.
- Emerging and improvised technology.