via the Warhammer Community
https://www.warhammer-community.com/2020/01/29/why-you-need-to-read-wrath-of-the-everchosengw-homepage-post-1/
Archaon has been somewhat missing during recent events in the Warhammer Age of Sigmar storyline, but he’s been busy! In order to dominate the Eight Realms, he needs to unite the Dark Gods once and for all, and there’s one who’s been conspicuously absent… The Everchosen believes he’s discovered the location of Slaanesh and is endeavouring to free the Prince of Pleasure when he receives a vision of the Varanspire aflame.
Meanwhile, Nagash knows that he needs to take the Eightpoints eventually – the Shyish necroquake and the creation of the Ossiarch Bonereapers were merely steps towards this goal. When he finds out that Archaon has left his generals in control of that blighted place, the Great Necromancer knows the time to strike is nigh. In Battletome: Ossiarch Bonereapers, we learned that Katakros was planning to invade the Eightpoints, and this book details that very war.
Treachery and Vengeance!
When Archaon learns the Eightpoints is under attack, he hastens to return to his armies, enraged at Nagash’s perfidy and being pulled away from his vital mission. When he arrives, it’s at the forefront of the mighty Legion of Chaos Ascendant atop his three-headed mount Dorghar, the elite of his mortal warriors joined by daemonic hordes united in a common cause.
The battles that ensue are truly epic, even in terms of the larger-than-life events we’ve seen in the Mortal Realms up to now. Where the forces of Nagash are cold, efficient and implacable, the armies of the Everchosen are zealous, reckless and aggressive. These armies are led by two of the most impressive generals the Mortal Realms have ever known: Orpheon Katakros, Mortarch of the Necropolis and Archaon the Everchosen, Exalted Grand Marshal of the Apocalypse – and the conclusion is far from forgone…
The Backdrop to the Clash
In addition to the ebb and flow of the war, in Wrath of the Everchosen, we also learn a lot more about the Eightpoints, formerly called the Allpoints before the corrupting power of Chaos changed it into a nightmare hellscape. The action of Wrath of the Everchosen takes place primarily in this benighted land, and the book explores it in great detail. Whether you find it fascinating or revolting, you’ll learn what happens when the worshippers of Dark Gods are left to their own devices. Warcry has already given us some insight, but now we see just how inhospitable the land has become, alongside how desperate and depraved the mortals who live there are.