Chaos Space Marines: Vashtorr The Arkifane

Having long kept himself shrouded from most races, Vashtorr is a demi-god of inventors, engineers, scientists, and artisans. He is empowered by acts of curiosity and innovation in the Materium, shorn of morality and driven to its darkest extremes. He has only manifested a handful of times in galactic history, and some crypto-scholars maintain he was created amidst the reckless arms race of some ancient galaxy-spanning war. Others propose he was brought about by the horrors of the Dark Age of Technology, where he proved a patron to many of its technological horrors. He is also said to have been empowered by events such as the rise of the Necrons, the Cursed Founding, and the creation of Primaris Space Marines.