Haarken Worldclaimer
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Haarken Worldclaimer is a Black Legion Chaos Raptor Lord leading a Black Legion probing force of Helldrakes, Chaos Raptors, and Warp Talons that have occupied the upper spires of the hivesprawls of Vigilus. He proclaims to the Imperial defenders that the world would fall to his forces in 80 days, and that Abaddon the Despoiler himself would come to claim the world.
In-Universe Profile
Called the Herald of the Apocalypse and Proclamator of Abaddon's Reign, commands the vanguard of the Black Legion forces on Vigilus. A scholar and collector of occult artifacts, he had read both the Grimoire Nostromo of Konrad Curze, the Book of Magnus, and the Clotted Scrolls of Angron (what), which means he's nuttier than a fruitcake on Saguinala.
It is not known if he was part of the Night Lords, but he uses fear in battle as much as they do, broadcasting terrifying messages and sounds through his own custom vox array. In battle, he uses the legendary Helspear.
His Rules
Haarken is a bit of an odd duck, abilities-wise. He has a buff that works for any Chaos Raptor, allowing them to re-roll any hits in melee. Except he can't even use this to re-roll his own Spear Throw attack.
Oh, and the Helspear? While statistically okay, it essentially acts as his 'only ranged attack (he has no gun, not even a pistol!), and what's worse, due to how its description is worded, he can't even use it in melee. Welp.