In Norse mythology, Odin sends his Valkyries to select the bravest warriors on Midgard. These brave warriors are then chosen by the valkyrie to die in battle and accompany them to Asgard. Once they are in Asgard, the fallen brave are divided between Odin and Freya. Those chosen by Odin are called Einherjar, which means One-army in Old Norse.
The sole purpose of the einherjar is to fight as Odin's warriors. Every day they train and prepare for the biggest battle in Norse Mythology; Ragnarök, meaning "Fate of the Gods".
The einherjar stay at Odin’s hall called Valhalla, the 'Hall of the fallen'. In Vallhalla, the einherjar will be taken care of by the valkyrie, who will give the warriors mead and ensure that they thrive.
In the morning when the einherjer wake, they ready themselves with their armor, helmet, shield and weapons, and then go to iðavöllr for combat training. The einherjar continue their brutal combat training until sundown, when the fallen arise unscathed, and all ride back to Valhalla as good friends, where the valkyrie serve mead and meat from the boar Sæhrímnir, to the einherjar warriors.
The einherjar symbol is the Valknut, a symbol consisting of three interlocked triangles. Valknut is from the Old Norse ‘valras’ meaning 'killed warriors’ and ‘knut’ meaning 'knot '. This symbol found on various Norse and Germanic places, like runestones and the Osberg ship.
THE VALKNUT ON THE STORA HAMMARS I STONE, GOTLAND, SWEDEN
One of the Norwegian kings who became an Einherjar is Håkon the Good. It is the valkyrie Skogul who chooses that the jarl will die in battle and be with her to Valhalla. When Håkon arrives at Valhalla, he dreads meeting Odin, as he chose a different faith. But Håkon is welcomed by the gods, and the god Bragi tells Håkon that he has eight brothers in Valhalla, that he should drink of the Æsir’s mead, and that would possess the peace from all einherjar.
Eirik Bloodaxe is another Norwegian king chosen to be einherjer. In Valhalla, the god Bragi wondered who was making the sound of thunder. Odin replied that Bragi know it was Eirik Bloodaxe who would shortly be arriving in Valhalla. There was a reason for celebration new einherjer came to Valhalla, especially einherjer who were kings.
In Norse mythology, Einherjar are a confirmation that to live a bold life, a person can be reborn at a higher level, meaning to live with the gods. With the gods, the einherjar have one task, which is to fight at Ragnarok, and sacrifice themselves for the new world.