Ever since the Lord Ruler was killed in the first Mistborn book, things have been getting worse. It all comes to a head in The Hero of Ages. The world is quite literally ending.
Sanderson’s strength continues to be his world building. We get a lot more details this time around. We learn of a few more Allomantic metals. We learn all about the third metallic art (only previously hinted at): Hemalurgy. On top of that, we expand on what exactly the Koloss and Kandra are, what abilities they have, and how they came to be. It’s crazy awesome how it all fits together and would be well worth the read just got that.