On Lorkhan: A Elder Scrolls theory

Elves

Child of Sithis: To understand Lorkhan you must understand Sithis. And to understand Sithis you need to understand the creation mythos, it all connects.

First there was nothing, just cosmic energies floating about in nothingness. From these energies came two primordial forces, Anu and Padomay. Anu was the force of order, Padomay was chaos.

These forces then birthed their own souls.

Anu birthed Akatosh, who could create time. And because of this existence began to take shape. Other beings morphed into existence in this new realm of order where time and space existed.

Padomay birthed Sithis, the opposite of existence. The god (if you can even call it that) of anti reality, the definition of void, nothingness.

Sithis birthed Lorkhan and from here the different mythos begins to differ, unless they already did so. This is a short summary of the most common story.

Elven myth: The elven myths are the most commonly used, in no small part due to Morrowind. What you read is mostly the elven version, and most elves sees Lorkhan the same, they even use this name which translates to Doom Drum. That is going to be important later.

Altmer sees him as basically Satan, the great evil one who deceived the spirits that existed at this time, usually referred to as Et'ada, to create the Mundus and the planet Nirn.

But unknowingly they sacrificed their power to it, when some figured it out they fled before loosing all their power. The only named one was Magnus, the god of magic and the architect of Mundus. In his wake was the sun, a massive hole in space that leads to Aetherius. The realm of light and pure magic, the others left behind the stars in a similar fashion, its from these holes that magic leaks onto Mundus. But others were not so lucky and became mortals, bound to Nirn forever. The most powerful became the Aedra, our ancestors, and would be some of the biggest gods to be worshiped by mortals later. But they were still bound to Nirn forever, a shadow of their former selves. As punishment they tried to destroy Lorkhan, but discovered that it was impossible. For he to was bound to Nirn just as they were.

So instead Akatosh ripped out his heart on top of the Adamantine tower, and fired it across Tamirel, where it landed in the ocean and the impact created the red mountain, where it would reside for who knows how long.

The book Lunar Lorkhan also claimed his body was cleaved and made into the 2 moons, Secunda and Masser that we can see in game during night time. But that's just one source, I'm very critical to this claim. (In short, the Moons were and are the two halves of Lorkhan's 'flesh-divinity'. Like the rest of the Gods, Lorkhan was a plane(t) that participated in the Great Construction... except where the lent portions of their heavenly bodies to create the mortal plane(t), Lorkhan's was cracked asunder and his divine spark fell to Nirn as a shooting star "to impregnate it with the measure of its existence and a reasonable amount of selfishness.)

Dunmer sees Lorkhan a little different, while they do not like him he is not the great enemy like he's to the Altmer. Dunmner sees life as a challenge, a series of obstacles to overcome. And Lorkhan is just one more challenge to conquer to achieve Chim, the process of becoming a god.

From what I tell Bosmer sees him extactly the same as the Altmer, the missing trickster god. As does the sea elves.

I could find nothing on the Falmer view, for so much of their culture was destroyed by vengeful nords.

The dwemer most likely viewed him the same as all other gods. Recognizing his existence but not worshiping, for they considered themselves above that, preferring their science and magic engineering that served them quite well....for a while.

I was unable to find the orcs view on Lorkhan, they don't seem to really care as Malacath is the only one that matters to them.

But the orsimer are a diverse and far spread people, views, culture and worship are going to differ from clan to clan, not to mention the city orcs that mostly adopt the mainstream religions around them. So maybe in the future we can find something that links them?