I discovered something very interesting as I was reading through the MB1 annotations.
http://www.brandonsanderson.com/annotation/163/Mistborn-Chapter-Thirty-Four-Part-Two says an interesting fact about the Lord Ruler.
I put the Lord Ruler in black and white--rather than just black, as I'd originally planned--to give metaphoric reference to his belief that he is God. He's both black and white--he encompasses all, and controls all. Of course, he's faking. In the mythology of this world, there are two forced--Ruin and Preservation--and he really only touched one of the two powers. But, then, we'll have more on that in later books.
Ruin and Preservation. This is probably the most crucial piece of information I've uncovered from the MB1 annotations (and yes, it took a herculean effort to say "crucial" instead of "interesting" a third time). I'm fairly certain this hasn't been discussed in the forum yet, so, let's talk about it here.\
Obviously this is a colossal revelation to... well, everything. The Allomancy-Feruchemy-Hemalurgy triads of magics are probably influenced, and most important, the exact nature of the Well of Ascension.
So let's think about this for a minute. The Well, of course, has a lot of power. Since Brandon just said the Lord Ruler touched one of those powers, its the one at the Well. That means we have either Ruin or Preservation to decide from here. This is the important part. We can presume that the Well Spirit inside there (locked away or imprisoned, whatever) is malevolent, sending the Deepness to cause chaos and "ruin" in order to make a Hero set it free. It lends itself to the whole Ruin mechanic there.
And really, the Lord Ruler isn't Mary Poppins. He is quite malevolent himself, and I'm pretty sure that he's responsible for the Ashmounts and the lack of green plants in the Final Empire (I say "pretty sure" because without MB3 out, there could always be something we don't know. Like if the Deepness actually was responsible for it. That's implausible, but I'm just saying. It could be a lot of things). If the Well, essentially, is the quintessential Ruin force, and the Lord Ruler got his power from there, then his power also derives from Ruin.
But then again, in a sense, the Lord Ruler "preserved" the world from certain destruction that the Well Spirit, or perhaps we should be calling the Ruin Entity or something along those lines, would have caused. If that's the case, that totally destroys my theory there.
If the Lord Ruler touched Ruin like I think he did, it could explain why he's a lot more evil. We don't exactly know the effect of what will happen as someone takes the Well's power for himself. Vin describes it like she would have to burn all the power away in a few instances. But you gotta wonder... the Lord Ruler can pierce copperclouds and has more power than even his Allomancy/Feruchemy could do, it seems. I doubt that instead of freeing the Ruin Entity, having it live inside you for a thousand years probably doesn't make you any more good, just more evil (I would think a Preservation influence would whip the Lord Ruler to not do his horrible atrocities).
It's logical to assume that if the Well of Ascension, as we know it, is merely the sum of the Ruin force, there could be a
second Well that has the power of Preservation, just for balance sakes. That doesn't make any sense, but it's possible.
Of course, if the Lord Ruler actually touched Preservation at the Well, and the Ruin spirit
also lives there (by some strange paradox), then the Well has both powers. But now I'm just confusing myself. Feel free to interpret this information any way you want. God knows I'm just perplexing myself with all of this.
But the whole Ruin/Preservation duality has to be recognized for MB3, that much is certain.