Everyone who had a system had access to the Divine Treasure Vault.
As long as they had millions of system points, buying even Legendary and Divine Weapons was not impossible.
Naturally, Thriteen's previous hosts were no exception.
Unfortunately, they were mere Cannon Fodders, so most of them never earned enough system points to buy such items. It could've been possible with more time, but their lives were cut short as they met their fated Bad End.
One of Thirteen's Hosts was an Einherjar who fought in the battle of Ragnarok.
He was one of the last Einherjars to die, all thanks to the grace of the Valkyries, Choosers of the Slain, who saved him from time to time.
Every proud warrior in Midgard who had died a glorious death in battle would be brought to Valhalla to become an Einherjar.
They were warriors meant to stand against the forces threatening the Nine Realms, and every one of them fought with unwavering valor.