Hero of the South

The Hero of the South is a hero who fought on the front lines against the demons for mankind before Himmel met Frieren. He was said to be mankind's strongest. The Hero of the South wielded two swords. The Hero of the South possessed enough tactical knowledge and battle acumen to push back the Demon King Army's frontline to the Northern Plateau.

He was immensely powerful, able to take down three of the Seven Sages of Destruction. The Hero of the South possessed a secret magic that allowed him to see the future. This prescience extended beyond his own death, as he was able to foresee that Himmel would be the Hero to defeat the Demon King.

(Source: Sousou no Frieren Wiki)