Going through this for each Traitorous Legion is a lot of fun. Its been a long time since I had a Chaos Marine army, but this is exactly what I would of loved back then. More info, more rules, and fun models on their way. Sounds almost like I need a new army.
Iron Warriors Preview via the Warhammer Community
https://www.warhammer-community.com/2019/03/19/19th-mar-heretic-astartes-focus-iron-warriorsgw-homepage-post-1/
Who are the Iron Warriors?
Since the earliest days of the Great Crusade more than ten millennia ago, the Iron Warriors Legion have been renowned for their mastery of siege warfare. None save the Imperial Fists could rival the skill of the Iron Warriors in this field – a trait that fostered a bitter rivalry between the Primarchs Rogal Dorn and Perturabo. In the wake of the Horus Heresy, this culminated in a mutually destructive, attritional war fought between the two Legions. Perturabo taunted Dorn to attack a nigh-impregnable, fortified death trap he had built, called the Iron Cage, which resulted in a bloody stalemate and massive losses to both sides.
Now, as a Traitor Legion, the Iron Warriors have lost none of the deadly siege skills that first cemented their name into legend. The Iron Warriors systematically destroy all before them through the merciless application of heavy ordnance and bolter fire. They regularly field entire armoured columns of Vindicators, Predators and Rhinos bearing their gunmetal and chevron Legion colours. The Iron Warriors Traitor Legionnaires are often accompanied by more esoteric creations, such as Daemon-bound war machines and the living weapons known as Obliterators and Mutilators.
