Tokyo_Bunny_8990: Im not an expert on Tolkien (only read the Hobbit and LotR back in middle school so its been a while) but Morgoth is in the Similarian right?
The
Silmarillion, yes. And also Children of Hurin, Beren & Luthien (where Sauron also plays a part) and Fall of Gondolin - all three published as standalone books, though they cover the events already described, in less detail, in the Silmarillion.
Tokyo_Bunny_8990: Also why were elves so OP? Their only "weakness" was that they are tied by destiny while man is free to create his own fate but men seem really underpowered in comparison (physically weaker, limited lifespan even its in the hundreds of years, maybe most corruptible). Dwarfs also get a raw deal given the fact that as a race, they should be pretty powerful. Strong warriors, cant be corrupted by the rings (at least in the movies), and expert craftsmen. Everyone loves the elves though.
You're thinking of it like it's a game setting, and supposed to be "balanced" :D You could just as well ask why bears are so OP compared to mice.
Also, mortality was never meant to be a "weakness". Not being forever tied to this world was just as much a blessing as a curse - remember that elves are tied to this world forever. Even if they should be killed, their "afterlife" is still a place within the bounds of this creation, and when eventually it will end, so will they. Men have but a short time here, but “In sorrow we must go, but not in despair. Behold! we are not bound for ever to the circles of the world, and beyond them is more than memory.”
Also, think of the Hobbits. They are the least "powerful" of all. Physically, or politically or militarily, they are the smallest of the small. And they don't care one bit. They are happier and better off than any other race in Middle-Earth. And when push comes to shove they are capable of deeds that destroy the mightiest evil. And that's, largely, the point. Power is illusory, lust for power self destructive. Immortality is no happiness.
Edit: oh, and dwarves did get corrupted by the rings, made greedier, more jealous etc. they just could not be controlled like men and turned into wraiths, because they are so immensly stubborn :D