Demonic cleaver: Carnage

swinging your and up you create a cleave of pure destruction in a 100 feet long and 5 feet wide line. Each creature in that line must make a dexterity saving throw, taking 8d8 slashing damage on a failed save, or half as much damage on a successful one.

additionally, a creature that is dropped to to 0 hits points by this spell is instantly killed.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d8 for each slot level above 5th.