Disintegration

A stroke of mystical hands forming a line 100 feet long and 5 feet wide blasts out from you in a direction you choose. . A creature takes 5d8 Disintegration if touched 

It turns people to ash in two hits it partly rusts in one.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.