Creeping Darkness

Create a 20-ft. radius sphere of magical darkness at a point within range. As a bonus action on later turns, move the darkness up to 60 ft. The darkness can crawl around corners, seep through cracks, and cling to ceilings or walls, but cannot pass through sealed total cover.

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