Android
Source Galactic Ancestries pg. 15

Your body is powered by a voidcore: an ancient marvel of technology with shrouded origins, older than most things in the galaxy. The first voidcores were constructed to power far larger equipment, but eventually they found their way into the heart of androids as an operational enhancement to existing cores. Today, voidcore androids are created by harnessing entropy through a ritual of corruption that calls on the Void. This influx of entropy reverses the energy state of the android, inverting the soul itself in the process. You're a voidcore android, with black, blue, or violet energy surging through your circuitry. You have void healing, which means you're damaged by vitality damage and not healed by healing vitality effects, and you don't take void damage and are healed by void effects that heal undead. You gain darkvision.