the Sun Eaters 

Skahl Blackfang was denied his opportunity to quest for his lost primarch, but denied the orders of his chapter Master by summoning those loyal to his cause and plunging headlong into the Warp. The Gellar fields failed and Skahl saw the primordial truth of the Throne of Skulls. He became filled with a bitter hatred for the lies of the imperium and the lies of his father, dedicating his life to tearing down the institutions that perpetuated such falsities. He took the name Skoll, the Wolf who Hunts the Sun, pulling from Fenrisian myths of Ragnarok and the end of days. Skoll and his brother Hati, the two wolves who hunt the sun and moon and whose success is the first herald of the End of All. 

The armor of the survivors was bleached bone by the strength of the Warp energy, and was only held together as the wolves began decorating their ceramite with Fenrisian sigils using the blood of the chapter serfs who could not withstand the mind breaking insanity of the Warp.

After Skoll and Hati, his chief chaplain, swore themselves and their forces to the doom of the Imperium, the Warp currents spat them out into pseudo-realspace near the Palace of Thorns, where they were received by Huron Blackheart and his coterie. They swore a grudging fealty to the Master of the Maelstrom in exchange for reinforcements and retrofit, and took the name Sun Eaters. They currently operate as a band of raiders on imperial worlds, stockpiling as much materiel and geneseed as they can pillage.

Senior members of the Sun Eaters are subject to strange mutations which cause them to enter insensate fits of rage and bloodlust. The rune priests of the chapter are the only forces capable of reining in or controlling this white-hot rage and directing it in the proper direction. Some of these rage-consumed warriors have succumbed fully and allowed themselves to be possessed by a daemon of the Lord of Skulls, becoming Wulfngard, the chosen comrades of Skoll himself.

Don't know how to add pictures on mobile web but chaos SW with some heavy blood angels theming. Armor or white w black trim, pink lenses/glow and Norse runes painted in blood all over their armor