Coure

Shapechanger. The Coure can use its action to polymorph into a form that resembles a aasimar commoner (same mental stats), a badger, a cat, a will'o'wisp, an owl, or back into its true form. Its statistics are the same in each form, except for the speed changes noted. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

Innate Spellcasting. The coure's spellcasting ability is Charisma (spell save DC 13). The coure can innately cast the following spells, requiring only verbal components:

At will: guidance, mending, resistance, sacred flame, thaumaturgy, toll the dead 

Magic Resistance. The imp has advantage on saving throws against spells and other magical effects.

Healing touch. The Coure can touch a willing creature and they heal 1d4 hit points. If they are at full health these count as additional hit points until you get hit.  

Invisibility. The Coure magically turns invisible until it attacks or until its concentration ends (as if concentrating on a spell). Any equipment the coure wears or carries is invisible with it.