Beast’s Resilience (DDAL10)

Starting at 6th level, your calling upon the animal spirits toughens your body. When you use an action to cast a warlock cantrip or spell, or use a warlock incantation, you can use a bonus action to add your Charisma modifier to your AC (minimum +1) and gain resistance to bludgeoning, piercing, and slashing damage until the end of your next turn.
You can use this ability 3 times, and then you can regain uses of this ability by completing a short or long rest.