Volgarr the Viking

To earn Ending A you will need to complete all six worlds, plus Yggdrasil’s roots (which plays as a world seven) on the Path of the Valkyrie. Warrior Spirits act as lives on the Path of the Valkyrie, so if you run out of Warrior Spirits you will get sent down to the Path of the Crystal, and have to restart the game if you want Ending A. Collect as many Warrior Spirits as possible while working your way through the upper path, this means taking as little damage as possible. It all depends on your memorization of the level, so watching video guides is recommended. More info can be found in the roadmap above.