Temporal Dissonance

You desynchronize time in a zone of warped rhythm.
Choose a point you can see within 30 feet. A 10 foot sphere from that point erupts with temporal dissonance. 

Each creature of your choice in the area must succeed on a Constitution saving throw or become Disoriented by Time.
While disoriented, the creature’s first attack each turn is made at disadvantage.
An affected creature can repeat the save at the end of each of its turns, ending the effect on a success.

Allies in the sphere gain advantage on Initiative rolls made while the spell lasts.