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An immobile (stationary), shimmering blue barrier appears a foot around every part of the caster's body and remains for the duration.

Any spell of level 4 or lower cast from outside the barrier can’t affect anything within it. Such a spell can target the user and objects within the barrier, but the spell has no effect on them. Similarly, the user and items within the barrier are excluded from areas of effect created by such spells. After the duration of the spell ends, the user is considered prone for 1 round.

Using a Higher-Level Spell Slot. The barrier blocks spells of 1 level higher for each spell slot level above 4.