Each space can be affected by Firestorm.

Firestorm occurs in Summer on a random selection of spaces equal to 4% of the map for every 40% of the map that is covered by Chaos, prefering GrassForestSoilCrops and Trenches tiles and avoiding other tiles if possible.

In the Decay phase, Firestorm deals 3 shots of 1 damage to tiles, ground units and air units in an indiscriminate damage step.

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