Bashiir's Gnashing Maw

I violent pool of furious necrotic insects with violently sharp mandibles are shot at your enemies. Make a ranged spell attack against the target. On hit, the target takes 6d4 slashing damage and on their turn take 2d4 necrotic damage from the hemorrhaging caused by the insects maw. As long as you hold concentration the insects can keep causing the target to bleed as a bonus action for 2d4 more necrotic damage. The target must spend their action to get the insects off of them.