Domed Spell Shield

A large dome of energy with a 15-foot radius appears around you, protecting the area from spells. This dome moves with you, and lasts as long as you maintain concentration on it. Until the spell ends, nothing (including creatures, objects, and terrain) inside the area of this spell is affected by other spells with an area of effect originating or cast from outside the dome.

When a spell (other than the originally triggering spell) with an area of effect that overlaps the area covered by the dome is cast, you must make a concentration check once any immediate effects of the triggering spell for this turn are resolved. The DC is 10 + the level of the triggering spell. If this concentration check is failed, your concentration on this spell ends and you take 1d6 + 1d6 psychic damage per level of the triggering spell.

To maintain concentration of the spell, you need to use an action on your turn to sustain the dome. If you do not use an action on your turn to concentrate on maintaining the spell, the dome fades and the spell ends.