Umbrachal's Mind Spike

You blast the mind of a creature that you can see within range, attempting to shatter its intellect and personality.

The target takes 1d6 psychic damage and must make an Intelligence saving throw. 

The target makes a Intelligence saving throw. On a failed save, the target takes 1d6 Psychic damage and has Disadvantage on ability checks and attack rolls for the duration. On a successful save, the target takes half as much damage, and the spell ends.

Additional Target increases on levels 5 and 11.
One additional target at level 5
Two additional target at level 11
The same person can be targeted multiple times but only rolls once for a saving throw.