Aiarcs Veil

An invisible barrier of magical force appears and protects you. Until the start of your next turn, you gain bonus AC equal to your spell casting ability modifier, including against the triggering attack. When activated it lasts until the end of your next turn.

When cast using a spell slot level 3 or higher you may expand the shield to protect an additional ally within 5ft per level of spell slot used. When this is used it appears as an arcane dome around the caster that extends to the ally