Board Thread:Lore Discussion/@comment-186.215.22.127-20130215011559/@comment-78.190.148.96-20180813003004

^Adding to that, about the whole oversoul thing, it might look confusing at first but it is very much like this:

There are three people:

-Hjalti Early-beard (Breton) - A soldier, WAS DRAGONBORN, no political knowledge.

-Zurin Arctus (Imperial) - A mage, Political knowledge, probably WAS NOT DRAGONBORN.

-Wulfharth (Atmoran) - A king, WAS NOT DRAGONBORN (Balgruuf lists him as one but in actuality and according to Arcturian Heresy, he was not. He even though he himself was called by the Greybeards and climbed to High Hrothgar when in actuality it was Hjalti who they called. Therefore they shouted Wulfharth apart)

Ysmir: Now, we have Ysmir firstly. Also called General Talos or Talos Stormcrown (Not to be mistaken for Talos, which is a god), he was an oversoul created from Hjalti and Wulfharth. They together could become a very strong force which could easily conquer in fights.

Tiber Septim: After Ysmir, Hjalti returned to Cyrodiil and sent Wulfharth to fight on his own. There as an emperor, his advisor Zurin Arctus helped him a lot to shape the Empire he created. Tiber Septim is both of these guys. It is not known if the two was physically one though, so Tiber Septim statues might be depicting Hjalti.

Underking: This is an oversoul consisting of Zurin Arctus and Wulfharth. When Wulfharth returned from fighting, Hjalti had prepared kind of a trap for him. He trapped his soul and did this also killing Zurin Arctus in the process or something like that (Sorry, I can't remember that part rn.) Both of their souls became one to fuel an artifact like thing named Mantella (You can think of it as a soulgem) which was used to make Numidium work.

Talos: After all the events with Numidium, Underking and stuff, all of these three (Hjalti, Wulfharth, Zurin) become an oversoul and a "god". The god thing is of course, a conflicted belief, and it might simply be a very powerful oversoul. We already know that Tiber Septim and therefore most possibly also Talos could use CHIM soo...

If you are a bit into TES lore, you'll notice what is shown to you is generally just a facade and you actually have to dig up books and even sometimes out of game infos (Especially from Michael Kirkbride) to reach the actual knowledge about the lore. The games (excluding the books in them) are generally just the tip of an iceberg about TES lore and even a lot of that is just false history taught to the people of Tamriel. The threads on reddit helps a lot about building the core of the lore but even then most of the things about the lore are theories and people generally try to pick and follow the one that makes the most sense. I also suggest reading the UESP, it helps a lot.