Bide

Bide time bracing attacks, preparing an attack powered by the damage received. Until the end of the next round, you receive the 'Biding' effect. 'Biding' prevents you from moving or using actions, bonus actions or reactions. All damage taken while you have the 'Biding' effect is tallied. When the 'Biding' effect is removed, the creature who last damaged you receives damage equal to double the total amount of damage you took while you had the 'Biding' effect. You automatically succeed concentration saving throws for this spell that are caused by receiving damage.