When you cast a concentration spell of 1st level or higher that targets a single creature (or affects a creature within its area), you may force the target to concentrate on it instead of you. The creature must make an Intelligence saving throw against your spell save DC.
On a failed save, the target begins concentrating on the spell as if they had cast it, using their reaction to sustain it. They are unaware they’re doing so unless they succeed on a Wisdom (Insight) check (DC = your spell save DC) at the end of each of their turns.
If the creature is asleep, charmed, or incapacitated, it automatically fails the saving throw.
You are no longer concentrating on the spell.
When the target's concentration ends, it must make a Wisdom saving throw. On a failure, it takes 1d10 psychic damage per round it maintained concentration (max 10d10) and is stunned until the end of its next turn.
Usable a number of times equal to your Intelligence modifier (minimum 1). Regain all uses after a long rest.