Firestar

Firestars, also known as moondancers, were a species of small, aloof glowing beings. They were frequently mistaken for will-o'-wisps. They could understand some languages including humanoid gestures and movement.

Ecology
A nocturnal creature, firestars would dance intricate patterns while exploring the landscape and ignoring nearby creatures or people. During the day, they would rest in elevated, unreachable areas and absorb sunlight and heat.

They were immune to most magic, excluding magical detection, cold-based spells, and magic missile.

Firestars possessed organs that were valued in several aspects of arcane spellcasting, worth between one to five gold pieces. One organ was used as a material component in the spell dancing lights. Other organs could be harvested for the production of magical inks used in scrolls of control flames, dancing lights, and detect magic.

Powers
These illuminated beings could willfully control how much light emanated from their bodies, from pitch black to as bright as a lit torch. They would use their radiance to communicate, changing both their patterns and intensity of flashing.

They could also absorb energy from natural or magical flames, and used this energy to heal themselves. If exposed to enough thermal energy the excess would be stored at a capacity four times more than a firestar that was not exposed to any heat.

Combat
Firestars attacked with a jolt of electricity that resembled a small lightning bolt, could be shot up to 30 feet, and was conducted by metal.