Chain Enervation

You fire a bolt of negative energy at one creature you can see. Make a ranged spell attack against the target. On a hit, the bolt does 12d6 necrotic damage and the creature must make a successful Constitution saving throw or gain two levels of exhaustion. The bolt then leaps to another target within 50 feet of the previous target that hasn’t already been targeted by the spell; you choose which target to attack, if more than one is available. The effect continues attacking creatures one after another in a chain until it misses or there are no more creatures eligible to be hit.