Nephalem

An unknown combination of upper and lower planes. Spawn of a Balor and Solar? May be a construct of some kind, the biological... ...doesn't quite add up. They're crafted.

Unknown's Research Notes

ability score increase: +2 and +1 to selected traits

age: Unknown

alignment: Can be any neutral

Size: Medium

speed: 30ft

Languages: Common, Celestial, and Infernal/Abyssal

race features:
Proficiency. Acrobatics, Perception, and Stealth Planar. You have resistance to necrotic damage, and radiant damage. Magic Resistance. You have advantage on saving throws against spells and other magical effects. Blindsight. 10 ft. Sleepless. Can’t sleep, must rest/light effort 4 hours a day.