World Flood

Choose a point within range. Water floods a region up to a 300-ft. radius, rising up to 30 ft. deep if terrain allows. You choose whether the water is calm, flowing, or rough. Hostile creatures entering or starting in rough water must make a STR save or be moved 30 ft. by the current.

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