Eldritch Scythe

Using the power of death itself, you summon an ethereal scythe that floats behind you like a wing of death, to strike down your enemies.  After casting the spell, as an action, you make a melee spell attack to a creature in melee range.  On hit, the creature takes 1d8 plus your spell casting modifier, dealing necrotic damage.

The number of scythes summoned increase as you reach higher levels, allowing you to attack more times for each summoned scythe: At 5th level you attack twice, at 11th level you attack three times, and 20th level you attack four times.  You roll for each attack separately.