As an action, you touch a willing creature who isn’t wearing armor, and its bones creak and contort to protrude from its skin. Its ribs and shoulders strengthen and protrude to protect it until the spell ends. The target’s Defense becomes 13 + half its Aptitude Bonus (min 1) + its Dexterity (max 4), it gains a Soak of 1, and it has disadvantage on Charisma skill checks using a social skill. The spell ends if the target dons armor or if you dismiss the spell on your turn (no action required).