I shall explain my wild yet also logical conspiracy theory in the comments

Lionel Richie in 40K

Rylanor MS paint

Hear Me Out...

Too depraved for Slaanesh.

Absolutely LOVE the new Black Coach they posted on WarCom

Oath of Moment markers for my Astartes

Retired assassin robots

Let the Nerf Hammer's aim be true.

Words were a mistake

Idoneth Deepkin aren't even the worst in Grand Alliance of Order.