Blind spot

A 15-foot-diameter immobile dome of ethereal light springs into existence around and above you and remains stationary for the duration. Everything within the dome is invisible to creatures outside of it. Creatures can enter and leave the dome freely. 

A creature that uses its action to examine the area the dome inhabits can determine its borders with a successful Intelligence (Investigation) check against your spell save DC.

The spell ends if anyone inside the dome makes an attack or casts a spell targeting something outside of it.