The Princip's spellcasting ability is Wisdom (spell save DC 14). It can be innately cast the following spells, requiring only verbal components:

Angelic Weapons. The Princip's weapon attack are magical. When the Princip hits with any weapon, the weapon deals an extra 2d8 radiant damage (included in the attack).   Aura of Protection Against Evil. Evil creatures have disadvantage on attack rolls against all allies within 5 feet of the Princip. Allies in this area can't be charmed, frightened, or possessed by evil creatures. If an ally is already charmed, frightened, or possessed by evil magic, the ally has advantage on any new saving throws against the relevant effect.   Magic Resistance. The Princip has advantage on saving throws against spells and other magical effects from evil characters and sources.