Striving for Strength

A feeling of resignation crept up in Kahn's mind as he chose to accept his current circumstances and decided to follow Romulus without making any more effort or retaliation. 

Why did Kahn accept being under someone else's control contrary to how he always preferred to be his own man and didn't submit to others? 

Because of 3 main reasons. 

First being the so-called Powerhouse who not only knew about Kahn's identity, where he had been or what personas he used till now but also was aware of all of his Divine Abilities, Blessings and pact with Rathnaar as well. 

And if he was aware of Kahn's pact with Rathnaar, means there was a possibility that he also knew about him possessing the Peak Saint's core as well as the Tablet of Arcana. 

These were the type of secrets even the most prominent empires in the world of Vantrea would wage a war for.