Aleister's Psychic Shroud

You trace Abjuration sigils in the air before you and thrust a handful of Diamond dust (50gp worth) into the air above your head. As the dust falls, it settles suspend in the air around your forming a shimmering arcane shroud.

For the spells duration, you are immune to being Charmed, are resistant to psychic damage dealt by melee attacks, and have advantage on saving throws against psychic damage (Intelligence, Wisdom, or Charisma). On a failed save you suffer half damage, and on a successful save you suffer no damage and shunt the psychic damage back at the caster/attacker.

At Higher Levels: When you cast the spell at a 6th level slot or higher, you are immune to psychic damage dealt by melee attacks.