Mage Armor

D&D 2024 spell: Mage Armor. Source: Player's Handbook (2024). level 1, school Abjuration, casting time 1 action, range Touch, duration 8 hours

You touch a willing creature who isn't wearing armor. Until the spell ends, the target's base AC becomes 13 plus its Dexterity modifier. The spell ends early if the target dons armor.

Source: Player's Handbook (2024), p. 293 - Licenses and attribution