Carrion Beetle

You attempt to implant a carrion beetle within the target with a touch attack. If you succeed, the larva bursts out of the enemy's skin at the beginning of his next turn, and must succeed on a Constitution saving throw. The target takes 2d6 piercing damage on a failed save, or half as much damage on a success.

Regardless, the beetle emerges from their skin and continues attacking them. While a beetle is attacking the creature, it deals 1d6 damage to the target at the end of its turn, and continues attacking the target until it or the target dies. If the target dies, at the beginning of your turn, the creature flies 50 feet towards the closest hostile creature it can see and begins attacking it. The beetle dies when the spell ends

A single beetle can be killed with an attack as a part of an attack action, as a bonus action by the target or a creature within 5 feet of the target, or when subjected to area of effect damage.

At Higher Levels. When you cast this spell at 2nd level or higher, the number of beetles increases by 1 for each slot level above 1st. Each beetle increases the initial damage by 2d6, and then begins attacking the target. These beetles must each be killed individually.