Intellect Fortress

level 3 - abjuration

Casting Time: 1 action

Range: 30 feet

Components: V

Duration: Concentration, up to 1 hour

Description not available (not OGL).
But here is a summary:

A willing creature has resistance to psychic damage and advantage on Int., Wis. and Cha. saving throws (+1 creature/lvl).

Bard

Sorcerer

Warlock

Wizard

Tasha´s Cauldron of Everything