Every way that has ever been fought has left behind it casualties whether they were is victims or the weapons used. Yes I said weapons, and one of the first to ever be given birth and helmed was the Lights Blade. A easily readied weapon that was pieced together from the bones of the fallen angels who died in the first salvo of heavens armies.
Created by Uriel and held in battle by Gabriel himself, it was first used against Sammael himself during the first days of the war, and after Uriel and his brigade was demolished by the FALLEN and the demons they had, it was again made into something even worse.
Sammael himself forged it further, embedding a piece of his very dark souls within it. The energies of his soul formed a large eye that seemed to judge all before it and decide who was Worthy and who would fall moments after touching it's hideous hilt.
Able to cut through heavens armies with a single swing it's only opposition was Yaweeh himself and his might. Even though he was stronger it still took himself and the combined might of all the remaining archangels too bring the blade and his rebel son down.
And only then after severing his sons hand was he able to touch the blade now that it sizzled with demonic energy, after the war it sat on the Earth for eons. Soon it's demonic energy would corrupt what grew over it, the Tree of Eden(the garden of Eden placed by God in hopes of cleansing the blade of it's demonic energy) itself being turned and sprouting it's devil fruit.
It now lies beneath the dirt guarded by Michael and Gabriel themselves in human guise for all of eternity, for they were the ones who had asked Uriel to forge such a weapon to combat their brother....