Als Strafe musste er auch Archaon krönen so als Demütigung.
Deswegen auch die Feindschaft zwischen den beiden.
Er will Kalif werden anstelle des Kalifen
https://warhammerfantasy.fando…r#Crowning_the_Everchosen
Be'lakor was subject to another End Times prince when Archaon started to subjugate the northern tribes while claiming the necessary relics to be named the Everchosen. Be'lakor held the Crown of Domination, and was the only one who could conduct the coronation - and only the Everchosen could receive the crown.[1a]
Furthermore, this would-be Everchosen was unlike any who had come before him, for he was of Be'lakor's own daemonic flesh and blood. He had been born from the rape of an Imperial peasant-woman, one of many such half-breeds that Be'lakor had fathered in his long existence. Despite this, however, he would give no quarter to the one who sought to become the Lord of the End Times.[6]
Be'lakor, in his guise as the Dark Master, had planned to take the Crown of Domination for himself, gather enough power to gain physical form by holding Albion in his grip, then descend on Archaon and feast on his soul in the view of the Dark Gods. However, his plans fell apart and, his immortal spirit filled with fury, Be'lakor was once again forced to perform the dark coronation. Descending like a dark angel, Be'lakor knelt before Archaon, hatred and rage filling his soul. He would once again be on the sidelines in the next great Chaos War.[