Create or Destroy Kneecaps

You either create or destroy the kneecaps of a creature.

Create Kneecaps. You replace the worn out knees of a creature, revitalizing their mobility. If they were a victim of the Destroy Kneecaps effect, new kneecaps pop into place and their regain their movement speed. If they had not previously been affected by Destroy Kneecaps, they instead gain a permanent +5 bonus to movement speed. A creature can only benefit from the movement speed buff once, unless the movement speed is somehow reduced.

Destroy Kneecaps. You completely and utterly destroy the kneecaps of a creature within range. Their movement speed drops to 0 until they can find new kneecaps, they are Incapacitated for 1 turn and knocked Prone. Also, they take 1d4 bludgeoning damage.