Synigism

You create a mystic bond between yourself and a number of willing creatures you can see within range, up to a number equal to 1 + your Charisma modifier (minimum of one creature). The bond links each creature to all the others for the duration.

Whenever a bonded creature is targeted by an attack, another bonded creature within 30 feet of it can use their reaction to become the target of the attack instead. The new target has a +1 bonus to AC against this attack. The attacker must reroll the attack roll.

If the attack hits the new target, the target takes an additional 2d8 psychic damage in addition to the attack's damage. The spell ends if you drop to 0 hit points or if you and the bonded creatures become separated by more than 100 feet.