Symbiotic Insect

You conjure a symbiotic insect that burrows into the target's body and accelerates their natural healing over two rounds. Choose a creature within range; the symbiotic insect uses the host's hit dice to heal the target. At the start of each of the target's turns while you concentrate on this spell, the target regains hit points equal to one of its hit dice + your spellcasting ability modifier.

If the target has no remaining hit dice, the healing only restores your spellcasting ability modifier in hit points.

At Higher Levels:

When you cast this spell using a spell slot of 3rd level or higher, the insect can use an additional hit die from the host per round for healing.