Touch of Drought (B)

You can change the range to touch. When you do, if the target fails its save by 5 or more, it gains a level of exhaustion, not greater than 3rd. A target resistant or immune to necrotic damage ignores this effect. 

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d8 for each slot level above 4th.