Mistborn Trilogy: The Hero of Ages, the Well of Ascension and the Final Empire

For a thousand years the ash fell and no flowers bloomed. 

For a thousand years the Skaa slaved in misery and lived in fear while the Lord Ruler reigned with absolute power and ultimate terror, a divinely invincible leader. Hope is long lost, until a terribly scarred, heart-broken half-Skaa in the depths of the most hellish prison and discovered he has the powers of a Mistborn. A brilliant thief and natural leader, Kelsier will turn his talents to the ultimate caper: one with the Lord Ruler himself as the mark. 

The impossible has happened. The Lord Ruler is dead has been vanquished. But so too is Kelsier the man who masterminded the triumph. The awesome task of rebuilding the world has been left to his protege Vin; a one-time street urchin, now the most powerful Mistborn in the land.

Worryingly for her Vin has become the focus of a new religion, a development that leaves her intensely uneasy. More worryingly still the mists have become unpredictable since the Lord Ruler died and a strage vaprous entity is stalking Vin.

Tricked into releasing the evil spirit Ruin while attempting to close the Well of Ascension, new emperor Elend Venture and his wife, the assassin Vin, are now hard-pressed to save the world.