Technically, in this case, the einherjar are those dead heroes who have retired into the Transcendent soul-ocean, and more precisely, that portion of it which quite resembles Valhalla. Of course, given the nature of the soul-ocean, the droplets that flow out aren’t quite the same as the droplets that flow in.
But that only makes the einherjar in their transcendent war-forms even deadlier.
So, not only is the Legion i Combat dropping on you, with all that fun of the usual Imperial mental magic that makes tactical Warminds, but this legion is dropping a close copy of the Transcendent Warmind, possibly including the Eldraic god of war.
Your threat level is about to go from “Excessionary” to “Extinguished.”