Some rooms don't properly convert to biome areas for the Boulderbough loot table.

The Monkey Island and Hermit Crab Island do not have the proper set topology id's for set clients on first load. This is a bug, though it will be low priority at this point in time as it does not concern the functionality of any mechanics of the game currently, Boulderbough's rely on server logic and are functioning properly.

GRAVE_AREA is unused content.

For VENT_AREA_SHADOW_RIFT, please remember that if you are using your mod and attempting to use the same logic of the Boulderboughs through the mod, riftspawner is a server side component and thus the client will not have any information to work off of.

local AREA_MODIFIER_FNS = {
    ["VENT_AREA"] = function()
        local riftspawner = TheWorld.components.riftspawner
        if riftspawner and riftspawner:IsShadowPortalActive() then
            return "VENT_AREA_SHADOW_RIFT"
        end
    end,
}

If you are interested in a very hacky solution, _preciptype in caveweather.lua is a network variable that will be set to the value known for acid rain on first precipitation when Shadow Rifts are active. This is not a reliable method, but creating client mods to mimic server behaviour often has design challenges like that.

Happy modding!

Changed Status to Known Issue

The Known Issue here are certain parts of the topology not setting the proper ID for clients on first load.

I have added a new bug report/fix about retrofitting fumarole biome, if anyone is still interested. i'm going through the forum posts mentioning this to those that might still care, so this comment will be duplicated a few times

Edited December 17, 2025 by Adgycarp
a promise not followed through