Viktor's Withering Ray

You channel the green fires of your necromantic being into three pulsing beams of energy that lash out at targets you choose within range. You can choose one target or several. Make a ranged spell attack for each ray. A target takes 1d10 necrotic damage and, if hit by at least one ray, must make a Constitution saving throw. If a target fails this save, it is poisoned until the start of your next turn. If a single target is hit by 3 or more rays and fails the saving throw, they additionally become slowed. If the target is healed in any way, it is no longer slowed.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you create one additional ray for each slot level above 2nd.