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[zetadin]

Hi. I'm trying to wall off most of the edges of the caverns, leaving a small gap for land creatures to spawn on, so they can be easily captured. But I'm having trouble with water at the edge of map. The wiki suggested caving in the roof onto it, but I can't dig into the tiles at the map's edge to do that. The only approach I have conceived of so far is to dump magma onto the water to turn it into obsidian and then build walls on top of that.
Questions:
- Is this all pointless as nothing will spawn in water anyway and so can't be cage-trapped?
- If stuff can spawn, will caving in the roof 1-2 tiles away from the map edge prevent it from spawning?

[Sutremaine]

You'll have to leave two tiles of water with the cave-in method. The one right at the edge of the map can be blocked off as you'd block off a dry land map edge, and the next one over can be floored over.

Cave blobs and pond grabbers will always spawn in the water once the RNG picks them as the next creature group, as they're aquatic creatures. FBs will spawn in the water if there's nowhere dry for them to appear. Other amphibious creatures may spawn in the water or on dry land.