I'm trying to determine how to get the 5e Darkness spell to move with a monster. It says
Magical darkness spreads from a point you choose within range to fill a 15-foot-radius sphere for the duration. The darkness spreads around corners. A creature with darkvision can’t see through this darkness, and nonmagical light can’t illuminate it. If the point you choose is on an object you are holding or one that isn’t being worn or carried, the darkness emanates from the object and moves with it. Completely covering the source of the darkness with an opaque object, such as a bowl or a helm, blocks the darkness. If any of this spell’s area overlaps with an area of light created by a spell of 2nd level or lower, the spell that created the light is dispelled.
It looks like it will move if it's an object I'm holding, and it won't move if it's being worn or carried by someone else. But what about casting it directly on a monster. Would that make it move with the monster? If not, is there some other way I can make the darkness stay around the monster?