That's a basic chorus. Repeating "God of War" for catchiness. Mentioning Aesir and Vanir, which are groups in Norse mythology. Using "blood and thunder," which is a nod to the first game's Colossus.
, there are several high-profile "rap pieces" created by the gaming community that capture the game's dark, vengeful atmosphere: god of war ascension rap file
If you are setting up the game for the first time, consider these "good content" additions: Update 1.12 That's a basic chorus