Almost all of my Elder Scroll characters have believed in Sithis. I was wondering, if Sithis could exist because of how there are so many believers of the Divines, and you even go to Sovngarde. I was curious, and just hoping to increase my role playing experience, could Sithis really exist with all these god's influences?

I assume you mean the Dark Brotherhood's interpretation of Sithis? If so, it's BS made up by the Dark Brotherhood at worst, Mephala playing lolz at best. But to answer your question, yes Sithis exists. No, the "Sithis" that Dark Brotherhood worships is complete BS, and is more likely than not reverence towards Lorkhan (see the Statue of Sithis and compare it to Lorkhan. The similarities are too striking to be a coincidence, among other things.)

But, if you want to know what Sithis is, http://www.imperial-library.info/content/monomyth that wasn't made by the insane and psychotic

To put it in more RL comparisons, worshiping Sithis is like worshiping gravity; no matter how many people, fruits, and sacrifices you throw off a cliff to appease gravity, you'll still fall at an acceleration of 9.81 m/s^2. Sithis is a force, the opposite to Anuiel. Both are the extremes that when joined together makes the universe that encapsulates the Aetherius, Oblivion, and Mundus.

Sithis, or Padomay does exist and actually predates all of the gods. Basically, Sithis is the primal state of chaos, while Anu is the eternal stasis. These two, in clash (The "Is Not" (-1) and the "Is" (1)) happen to be the origin of everything that is the Elder Scrolls and the foundation point for the theory of CHIM.

Do Daedric princes exist?

Interesting, Have my Dark Brotherhood worships, been false, or are they true to Sithis/Padomay? And Aslo, if this sort of Ying-Yang theory, is true, then what is the afterlife for, for these beliefs?

If you're going to use numbers, I prefer the comparison of using the 1 and 0 for computer language. Anu represent the "1" while Pado is the "0". Alone, they are opposite extremes. When thrown in together you get long chains of 0s and 1s, which make up the Aurbis. It just happens that the Aetherius would contain more 1s, and Oblivion 0s.

Again, to reuse my example, worshiping Sithis is like worshiping gravity; no matter how many people, fruits, and sacrifices you throw off a cliff to appease gravity, you'll still fall at an acceleration of 9.81 m/s^2. Same deal with Sithis. It doesn't know, and if it does, it doesn't care. Sithis simply is the opposite to Anuel.

If anything, the Dark Brotherhood's worship of Sithis is more likely to Lorkhan than Sithis. To explain this, I want you to first look at the http://images.wikia.com/elderscrolls/images/c/cc/Sithis.jpg. Notice, the being depicted in it looks like the Grim Reaper or Death. It was Lorkhan that brought the concept of Death with the creation of Mundus. In addition, the figure has no heart. In every myth of Lorkhan, his heart ends up missing, usually with it torn out. And to throw in that Lorkhan is also about Limits. Death is very much the Limit to life. Without it, it goes on forever. The Dark Brotherhood worship the concept of Death and Limits by killing.

Well, that is the Dreamsleave i belive? Where souls go when the body dies, merge together into one mass, and then... populate? the bodies of the newly born. (Not that far from the idea of Lifestream used in Final Fantasy 7, really.)

Special afterlives like Sovngarde souls are granted access only if an aedra or daedra intervines.

...Or atleast that's how i've understood it

But the antrophomorphisized idea of Sithis Dark Brotherhood has is wrong, it is chaos. No point in worshipping it any more than gravity, like some people have put it before

Edit: hmm, UESP makes no mention of such place, but i'm sure i saw someone how knows their lore mention it Oh well, to be safe, assume i'm full of crap

Edit 2: aha, found it: http://www.uesp.net/wiki/Lore:Aetherius It's "Dreamsleeve", not "-leave" And that also notes that i was mistaken. Sovngarde is part Aetherius like Dreamsleeve. The princes' realms are part of Oblivion though, so that i still believe needs daedric intervention?

So I am not The Listener? Damn. And The Aedra and Daedra are the one's to be worshiped?

You are the Listener, as it is a rank in the Dark Brotherhood. And yes, pretty much, though some people prefer to become gods themselves or greater, a task that has been accomplished more than once.

Then lastly, Who is the Night Mother, just a spirit, or some sort? If I lived in Elder Scrolls, I would rather wish to be immortal, then become a god.

Well, one book in-game states that the nightmother was just a common woman long time ago, that took a part of the Thieves Guild and allowed them to use more... drastic methods. How she became what she is isn Skyrim (and Oblivion too) i don't think is stated.

However there is also the stuff about how DB spearated from the Morag Tong of Morrowind due to Morriwind disallowing them to worship Mepahala, which they later abandoned anyway

Maybe it's just Mephala speaking trough her corpse?

Possibly, why would she lie to all these people, and create this cult? Talk about b*tchly old ladies....

Because Mephala is the Daedric Prince of doing [censored] like this. (S)he is called 'The Webspinner' for a reason.

But also, information on The Night Mother has been thus far.

• She was a high ranking member of the Dark Brotherhood, though unreleased (Daggerfall & Morrowind)
  
• She was a member of the Morag Tong, who murdered the first Potentate after Reman III. (in-game Books)
  
• She was a member of the Thieves Guild (in-game Books)
  
• She was a lady who bore 5 children and they became the first members of the Dark Brotherhood as The Black Hand (Oblivion)
  
• She was a dunmer lady who killed all of her children, because Sithis told her, and was executed (Skyrim)

As you can see, every single story about "The Night Mother" is constantly changing, just like how ever member who talks about "Sithis" is constantly different. You ask me, it's Mephala keeping herself relevant in the organization that broke away from the Morag Tong (who are Mephala cultists), and practice a business-like group, rather than a strictly religious one.