Mistborn Trilogy Omnibus And Book 4 Alloy of Law by Brandon Sanderson

The Final Empire
The Sliver of Infinity, the Lord Ruler, is the locus of religious and temporal order in a world in which the skaa are slaves or worse. Half-skaa erstwhile thief Kelsior is the only person to survive and escape the Lord Ruler's most brutal prison, in which, however, he discovered he has the powers of the Mistborn, which are based on the internal "burning" of certain metals, all of which the Mistborn can use, while most others can burn only one. Now Kelsior plans his most daring raid ever, into the center of the palace to discover the secret of the Lord Ruler's power. Beforehand, his band finds the half-skaa orphan Vin in another thieving crew, where she's useful because she brings good luck. She is also Mistborn and, if she can master and learn to trust her powers, will enable Kelsior's crew to infiltrate the nobility and possibly overthrow the status quo.

The Well of Ascension
The novel begins after most fantasy series end, when the team of brave and cunning heroes find that holding on to power is even harder than overthrowing the previous tyrant. Elend Venture, the scholarly new Lord Ruler of Luthadel, clings to power while Luthadel's aristocrats and merchants grumble and two enemy armies—one led by Elend's father, Lord Straff—camp outside the city gates. Fortunately, Elend can rely on help from his lover and unofficial court assassin, the young allomancer Vin, but her magical metal-using ability makes her a target. An orphan of decidedly low origins, Vin is also having trouble adapting to her position as royal consort, especially since the underclass skaa, newly freed by Elend, look to her as their protector. Meanwhile, the ancient evil known as the Deepness is rising once again.

The Hero of Ages
The Lord Ruler is dead, and Elend Venture is working on consolidating his rule. But the mist is becoming actively dangerous, ash falls almost constantly, and brutal earthquakes are shaking the world apart. The subtle, nearly omniscient Ruin is infiltrating both Elend’s army and his opponents. Fortunately, the stubborn Vin vows to discover a way to destroy him. When failure seems imminent, help comes from unexpected quarters.

Alloy of Law
Three hundred years after the events of the Mistborn trilogy, Scadrial is now on the verge of modernity, with railroads to supplement the canals, electric lighting in the streets and the homes of the wealthy, and the first steel-framed skyscrapers racing for the clouds.
Kelsier, Vin, Elend, Sazed, Spook, and the rest are now part of history—or religion. Yet even as science and technology are reaching new heights, the old magics of Allomancy and Feruchemy continue to play a role in this reborn world. Out in the frontier lands known as the Roughs, they are crucial tools for the brave men and women attempting to establish order and justice.
One such is Waxillium Ladrian, a rare Twinborn, who can Push on metals with his Allomancy and use Feruchemy to become lighter or heavier at will. After twenty years in the Roughs, Wax has been forced by family tragedy to return to the metropolis of Elendel. Now he must reluctantly put away his guns and assume the duties and dignity incumbent upon the head of a noble house. Or so he thinks, until he learns the hard way that the mansions and elegant tree-lined streets of the city can be even more dangerous than the dusty plains of the Roughs.