Ignited Terrain (PSR Supplement)
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Ignited terrain is a common hazard. This hazard represents at least a 5-foot patch of bush or ground that is currently consumed with flame, or a tower of flame that fills at least a 5-foot cube of air.
When a creature first enters ignited terrain or starts its turn there, it make a DC 10 Dexterity save. A creature with resistance or immunity to fire damage needn't make this save.