Winnowing

Spell Lists: Druid, Ranger, Sorcerer
3rd-level conjuration
Casting Time: 1 action
Range: 60 feet
Components: V, S, M (a handful of dust, ash, and crushed leaves)
Duration: Concentration, up to 1 minute
An intangible nature spirit appears in a space which is a 5-foot cube within range. It has the appearance of a beast or fey of your choice, though skull-headed and decrepit. As a bonus action on your turn, you can move the spirit up to 30 feet to a space you can see.

An aura of decay surrounds the spirit, manifesting as an unnatural stillness of the air and a smell of dry rot. Whenever a creature within 15 feet of the spirit regains hit points, it regains only half the amount.

Additionally, if a creature in the area is dealt bludgeoning, piercing or slashing damage, the spirit can empower that damage (no action required). Empowered damage counts as magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage, and the spirit deals an additional 2d8 damage of that type to the target, or 3d8 if it is an undead that has flesh (such as a ghoul or zombie). This additional damage cannot be higher the initial damage. After doing so a number of times equal to 1 + your spellcasting modifier (minimum of twice), the spirit disappears.