Tales of the Valiant Players Guide (pg. 284)
6th ring Arcane, Abjuration
An immobile, faintly shimmering barrier springs into existence in a 10-foot radius around you and remains for the duration.
Spell attacks that originate from a creature outside the barrier or any spell of 5th circle or lower cast from outside the barrier can’t affect creatures or objects within it, even if the spell is cast using a higher circle spell slot. Such a spell attack or spell can target creatures and objects within the barrier, but the spell attack or spell has no effect on them.
Similarly, the area within the barrier is excluded from the areas affected by such spells.