Oath of Loyalty

The Links of Loyalty of the Berserkers and Warlock Centaurs evolved into something bigger. Grander. 

They transformed into something even more powerful than the True Link of Loyalty.

Michael could instinctively tell the changes in his bond with the Berserkers and Warlock Centaurs. It would be impossible for them to betray Michael, and they would die alongside him. 

That was a terrifying restriction. Nobody would want to die just because their Lord died. However, the 'sacrifice' of their safety came with a drastic increase in power. The Vassals of the Lord were given access to a portion of their Lord's Soul Power. 

Despite being Awakened, their Soultrait's power would skyrocket and reach new thresholds.

They weren't mere Awakened anymore. The Warlock Centaurs and Berserkers subordinate to Michael evolved into more than that.