My main bet is on a
dung ages-esque nods to Tolkien's LotR.
1) The Great Ordeal is an army of distraction, a device to turn someone's eyes away from a much more lesser group. Aragorn / Kellhus on the Morannon field / Black Furnace plain.
2) That lesser group carries the
macguffin. Something unique and powerful, a crucial part of
big bad power. One Ring / Inverse Fire. Akka & Mimara, Serwa & Sorweel / Sam & Frodo.
3) Heron spear is Narsil Anduril and would be recharged / reforged.
Red herring though. Sauron / No God doesn't walk the earth, no Fingolfin-like action scenes. Weapon is mostly used to convince Eomer / remind Mekeretrig about Telcontarity / Anasurimbority of the wielder.
4) Dunno if there is a place for Theoden and Denethor after Sakarpus / Gondor. Maybe some consult generals for Gandalf / Akka to redeem or to drive to suicide?
5) Skin-spies are nazguls, keepers of the Inverse Flame / One Ring. Always near, constantly chasing, never succeeded.
6) The One Ring / Inverse Fire is lost by owner, found by stranger, carried by hero. First one is lost geographically, while second one is lost as a concept, inchoroi actually forgot a technology. So, Judging Eye, rooted Seswatha's memories, nonmen imprisoned in a helm are kinda shards, reflections and thousandfold-requoted quotes about blueprints of Inverse Fire or maybe No God. This way we'll have few Frodos and Sams, yay! Even Kellhus would be part-time Frodo, while he is "throwing" swayali and mandati against consult ranks to insure the total eradication of distributed, "p2p" Seswatha.
Ok. That's crazy enough. I'll save the 7th paragraph for the future.