regarding Fulghor, the markings on his weapon bear a passing resemblance to Rauh script
if he could be connected to Rauh, that would explain why he looks similar to Devonia, who was looking for the origin of the crucible and ended up there. Perhaps at that time people could turn into animals at will or some such. We know of Miriel and possibly more big turtles (Chelona, Testu) capable of intelligent thought, and Torrent seems to be a highly intelligent goat-mule capable of recognizing the next Elden Lord.
dating Fulghor as from Rauh or at least that time period could also indicate that the Night reaches into the past and pulls people from different time periods together, like in Dark Souls, that is featured in this story. (I believe when Artorias is defeated they retreat into the Abyss instead of dying.)
also, "According to legend, (Fulghor's) mightily radiant gods were able to conceal themselves in the roar of the thunder", which could possibly indicate Ancient Dragons. we see at least Placidusax be able to turn into a cloud of storm of lightning (his spear confirms this is a transformation and not an illusion), and other ancient dragons disappear in a cloud of dust-like particles in certain circumstances. I usually date Rauh and Farum Azula as at least partially overlapping because the enormous drake at the base of the jagged peaks could have been killed by a horned giant such as the one we see in the specimen storehouse. I don't think the sword belonged to an Ancient Dragon because they are consistently associated with polearms (spears in general, glaive for lansseax that is actually "naginata" in japanese) with the exception of a judge's gavel for florissax.
