Protective Aura

4th-level abjuration (formula, ritual)

Casting Time: 1 minute (5 phases of 2 rounds when cast as a formula)

Range: Self (5-foot-radius circle)

Components: V, S, D (circle centered on you), T (immediately before casting another spell)

Formula Ability Checks: Intelligence (Arcana) or Wisdom (Yog-Sothothery) DC 19 (diagram), Intelligence (Arcana) or Wisdom (Yog-Sothothery) DC 19, Intelligence (Arcana) or Wisdom (Yog-Sothothery) DC 19

Formula Backlash: 4d4 psychic damage

Formula Failure: One level of exhaustion

Duration: Until you finish casting another spell

You siphon magical energy from another spell to shield yourself from danger. To do so, you must remain within the diagram and begin casting another spell before the end of your next turn after you finish casting this spell. Once you begin casting another spell, you gain resistance to bludgeoning, piercing, and slashing damage from nonmagical attacks and protection from extraplanar creatures while you continue casting the new spell. The protection from this spell means that all attack rolls upon creatures in the area by aberrations, celestials, elementals, fey, fiends, and undead are made with disadvantage and creatures in the area can’t be charmed, frightened, or possessed by such creatures while you continue casting the new spell. Aberrations, celestials, elementals, fey, fiends, and undead can’t enter the spell’s area unless they succeed on a Charisma saving throw. If the saving throw fails, it can’t be attempted again and the creature’s movement ends.