Short answer: Misty Marsh is a forest of giant trees over poison swamp. Its Haywire weather, Black Tide, keeps deepening Stardust contamination and drains your Sanity while you gather. Wear a Black Tide Protective Mask, and collect Black Tide Clots here for diving gear and water facilities.
Haywire weather: Black Tide
M1swamp
Black TideSanity drain
- effect
- Stardust contamination keeps getting deeper, and Wild, Phantasmal and Mirror contamination zones appear in set places. Gathering its special resources costs Sanity
- counter
- Black Tide Protective Mask (slows Sanity loss inside Black Tide areas)
- tip
- Haywire weather has calm spells between active periods; check the timing before a long gathering run
Full counter list for all four Haywire seas: Haywire zones and their counters.
Resources
M1gather
- signature
- Black Tide Clots from the black water near the spore growths; the higher your Sanity, the more you get
- used in
- diving gear and water-circulation facilities: Diving guide · the water purifier recipe now needs them test-server report
- also
- Stardust Ore and contaminated plants · Tidal Gum (trunks) and Tidal Fruit (canopy) from the giant trees
- where
- Black Tide contamination zones show on the map with a countdown timer test-server report
Dangers
M1hazards
- Sanity
- Black Tide and clot gathering both pull your Sanity down. Bring the mask and Sanity food or drink before you start a gathering run
- contamination
- Wild, Phantasmal and Mirror zones spawn as the Black Tide deepens
- terrain
- Poison swamp under the trees
What’s here
M1terrain
- terrain
- Giant trees, poison swamps, mushrooms and rotting wood in a dense forest; sunken-ship caves among the trees
- names
- Island and POI names aren’t published yet; this section grows when they are
More for Misty Marsh
- Haywire zones and their counters
- Diving: oxygen, pollution, cold
- Isles of Abyss map: all 5 sea areas
- Isles of Abyss hub: dates, guides and the other seas
Sources
- Starry Studio (oncehuman.game), New Survival Scenario Isles of Abyss Launches Officially on October 21 (dev blog, 16 Oct 2026)
- Starry Studio (Steam), Ocean Expansion: Isles of Abyss Is Now Live (patch notes, 21 Oct 2026)
- Doomeris (YouTube), EVERYTHING ABOUT ISLES OF ABYSS - SHIPS, CANNONS & NO CRADLE?! (Full Dev Blog)
- Gotcha Beast (YouTube), How to Be Ready Day 1: The Ultimate Isles of Abyss Guide
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