How to get the Legacy Spartan Rage in God of War Ragnarok

While it's never been explained how he achieved his new ability, do you Kratos had achieved Spartan Rage by mastering his rage in Midgard? : r/GodofWar

Kratos, God of War 2018

Spartan Rage, God of War, Dumigor

Rage Ability, God of War Wiki

God of War Tips - How to save, how to parry, when to use Spartan Rage

Best Spartan Rage In God Of War Ragnarok - Gamer Tweak

How To Increase Your Spartan Rage in God of War Ragnarok

Spartan Rage - NeatoShop

Every time Kratos uses Spartan Rage to save himself or Atreus his enemy doesn't know what is happening. They are suprised about Kratos' ability : r/GodofWar

In God Of War 5, don't you feel bad for Thor? Unfortunately Kratos is well known for killing gods, how could Thor's Viking berserker rage possibly stand up to Krato''s Spartan rage?