Codex: Chaos Space Marines (2017), p32 — The Technovirus Rages

The transmogrifying plague known as the Technovirus spreads from Medrengard's deepest dungeons across the worlds of the Eye of Terror. It infects metal construct and mortal body alike, turning one to the other and blending warriors with their weapons and wargear until only sentientmetal machine-things remain. After the resultant conflicts, known as the Wars of Flesh, the nihilistic Cult of Destruction proliferates massively. Obliterators and Mutilators join the ranks of the Iron Warriors in ever greater numbers.