"Korah" is not in the Star Wars Duel of Fates lyrics.
Instead it is the Sanskrit word "khara" and it means dreadful. In the lyrics, it is a story of a battle of trees and none of the trees is named, indicating this is not referring to a specific historical figure like Korah. Khara does not appear to be a proper noun.
Korah represents pride and arrogance but the meaning of these lyrics is about the dreadful battle experience.