Dome of Radiance

You conjure a dome of light that surrounds you in a protective radiant barrier.

You summon an orb of light that expands to a 15-foot radius around you and remains for the duration. You and each creature you choose gains a +2 bonus to AC while inside the dome. When a creature not of your choosing enters the area for the first time on a turn or starts its turn there, it must make a Wisdom saving throw. On a failed save, the creature takes 3d8 radiant damage. On a successful save, the creature takes half as much damage. 

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the radiant damage increases by 1d8 for every spell slot above 2nd.