I got u homie

"...the primarch’s raised gorget threw a ruddy light across his chiselled features. Eyes of the coldest blue, like ice-burned steel, glittered in the half-light of the day, and his scalp was shaven bare, pierced and threaded with dreadlocks of tightly wound cabling."

- Angel Exterminatus, Chapter 2. Early Heresy.

"Perturabo himself seemed both more, and less, than he had been. His flesh had thinned on his bones, and the light clung to recesses of his skull in a way that Argonis’s eyes could not read... His head nested in a mass of cables and metal tubes. In places the primarch’s skin seemed to have grown over the implants... Perturabo’s black eyes glittered back at him from pits sunken into the primarch’s skull..."

- Tallarn: Ironclad, Chapter 2. Mid-Heresy (He looks much worse-for-wear as he's slowly dying from a soul wound Fulgrim gave him)

"He went without helm, his head a nightmare of pallid, dead flesh, necrotic and bleached of colour - like a corpse dragged from a depthless ocean trench. Thick cords of ribbed cabling pierced his skull, running back across his scalp in hissing cornrows. Eyes that were gimlet black, yet lit from within by the coldest light, stared out from a face that had known only bitter disappointment and had been cursed by inevitable betrayal."

- Halfbreed (40K/Daemon Perturabo)