Thought Purge

You attempt to halt a creature's train of thought.  The target must succeed on an Intelligence saving throw or take 2d6 psychic damage and be unable to speak or take reactions until the beginning of its next turn.  If the creature was concentrating on a spell or similar magical effect, they have disadvantage on the concentration saving throw caused by this spell's damage.  This spell has no effect on creatures with 3 or less intelligence or constructs.

Alternatively, you can choose to cast this spell without dealing damage.  If you do so, the target must succeed on an Intelligence saving throw or be unable to speak or take reactions until the end of its next turn (or for 2d4 seconds out of combat.)  If the target is concentrating on a spell or similar magical effect, they must make a concentration saving throw.  A target who suffers this effect realizes it was caused by magic immediately after the effect wears off.

When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.