You gain resistance to psychic damage.

Half of the psychic and force damage done to you can be reflected back to the attacker.

You gain immunity from being stunned or charmed

You gain advantage on Intelligence saving throws, but a disadvantage on Charisma saving throws.

You get a -1 to AC while wearing this armor.

This armor consists of a fitted metal chest piece worn with supple leather. Although it leaves the legs and arms relatively unprotected, this armor provides good protection for the wearer's vital organs while leaving the wearer relatively unencumbered.

Notes: Resistance: Psychic, Advantage: Intelligence Saving Throws, Bonus: Armor Class, Immunity: Charmed, Immunity: Stunned, Disadvantage: Charisma Saving Throws, eldritch knight / warlock, Combat, Warding, Cursed