Wither

You speak incantation and wave your hand towards the target and it must makes a Constitution saving throw. On failed, it takes 3d6 necrotic damage and gain one point of exhaustion. On success, it only takes a half of damage and does not gain points of exhaustion.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot level above 2nd. If you cast this spell using a spell slot of 4th level target gain two points of exhaustion, and gain three points of exhaustion If you cast this spell using a spell slot of 6th level or higher.