Detonation Field

Make a 20-ft. radius area within range volatile. The area is difficult terrain. The first time each turn a creature in the area takes damage, moves more than 10 ft., falls prone, or hits a surface, it must make a DEX save, taking 4d8 fire, thunder, or force damage on a failed save.

This power has its own stable page so it can be linked from any character, item, location, story post, bargain, curse, or future reward.