Each space can be affected by Bonedrought.

Bonedrought occurs on Desert tiles if at least 60% of the map is covered by Chaos. Bonedrought also occurs on CityTownFarmOutpostBarracksIndustryAirfield and Rubble tiles if at least 80% of the map is covered by Chaos.

If Bonedrought is present on a space, it lowers the hitpoints of tiles and ground units in that space by 1 (down to 1), making them more vulnerable to damage.

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