The Influence

Kahn was astonished after finding out that the 4th Hero of Life was also from the Earth just like him. And he was a Viking at that. 

Kahn himself had seen some people during his time in Flavot City that had appearances influenced by Viking culture. 

The first person that came into Kahn's mind was Stragabor Sigurd. A Grandmaster Rank individual who had tried to kill Kahn in the name of avenging his brother named Illya who tried to ambush and kill Kahn back when he had just entered the world of Vantrea. 

Their entire clan looked like they were descendants of vikings based on their appearance and tattoos. 

[[Author : See how far I had planned even a year and a half ago when I started this novel? This is how you connect all dots in a homogeneous world-building. *pats myself on the shoulder shamelessly*]] 

Later, Kahn killed Stragabor and ate his core to become a Grandmaster himself.