Call of Archaon: Age of Sigmar: Realmgate Wars, Book 5 (Unabridged‪)‬

Of the many champions of Chaos, none are as great or as feared as mighty Archaon. He is the Everchosen, Exalted Grand Marshal of the Apocalypse and Ender of Worlds, and it is a worthy warrior indeed who can fight by his side. Such Knights of Ruin are known as the Varanguard. Only by answering the call of Archaon can a warrior of Chaos ascend to their ranks, and acceptance is never guaranteed, for their mettle must first be proven.

In this dark tale, three fell champions of the Chaos Gods all heed the call of the Everchosen. Each desires the ultimate prize: to become part of the Varanguard. But where one is chosen, others will fail, for Archaon's will is cruel and his trials exacting....