» Sun Jun 03, 2012 10:53 pm
This is what we know for sure (game lore):
Lorkhan either convinced or tricked some of the "gods" (Aedra) into creating the material plane, Mundus. During the creation, many of the involved gods backed out or fled, but 8 of them (Stendarr, Kynareth, etc.) continued, and Mundus was created.
Many of the gods were angry with Lorkhan, they killed** him, tore out his heart, and tossed it into Nirn (the world of Skyrim, Tamriel, etc.). The heart ended up buried deep in what would be known as Red Mountain.
Many elves, particularly the High Elves and Dwemer, believe the whole creation thing is a mistake, and want out (a return to a purely spiritual existence).
Thousands of years ago, the Dwemer living in Red Mountain discovered the heart of Lorkhan. The Chief Tonal Architect, Kagrenac, began experimenting on it. Kagrenac built Numidium based on some goals regarding the heart.
The Dwemer and Chimer (ancestors of the current Dunmer or Dark Elves) had been warring, but had gotten over their differences, thanks largely to King Nerevar of the Chimer, and King Dumac of the Dwemer. Nerevar found out that the Dwemer had discovered and were experimenting on the heart. Nerevar was troubled by this and consulted Azura, who told him to confront the Dwemer and insist that they stop. The Dwemer are offended by this. The Chimer and Dwemer go to war. Other races get involved.
In the midst of the confrontation between the big players (Nerevar, Dumac, Kagrenac, Dagoth Ur, etc.), Dumac is slain, Nerevar is injured, and Kagrenac strikes the heart of Lorkhan with his magical tools. The entire Dwemer race disappears.
The 3 advisors of Nerevar--Vivec, Almalexia (also Nerevar's wife), and Sotha Sil--murder Nerevar to take the heart for their own. Through the power of the heart, they (and Dagoth Ur), become gods. Azura curses the Chimer for the actions of the 3, changing them into the Dunmer. Vivec, Almalexia, and Sotha Sil become the Tribunal, the gods of a new Dunmer religion. Dagoth Ur begins his unending battle with the Tribunal over the heart.
**Values of death for a god are not the same as for a mortal, so he still makes occasional appearances despite being dead.
This is what is generally accepted as well:
Kagrenac used the Calling to summon the Dwemer, and they melded together into the skin of Numidium, attempting to become a giant, collective intelligence god-robot. Something apparently went wrong, possibly due to interference from Azura, possibly due to the rush or miscalculation.
Michael Kirkbride, one of the writers of Morrowind and Oblivion, has directly supported the above interpretation outside of the games.