The Nullification Engine

An infernal engine threatens all life. A sorcerer's apprentice has no idea how to stop it. The Alchemancer series continues.
The city of Brighton promises new beginnings for Aaron, Serena, and the taciturn eslar, Ensel Rhe. But, upon their arrival, Aaron and Serena are arrested for their role in the Chaos of a week ago, while Ensel Rhe slips away on business of his own.
The pair are given the opportunity to plead their case before the earl himself, whereupon they are released and assigned a very special duty, for deep below the palace lies the Nullification Engine, an ancient machine completed hundreds of years ago but never activated. Until now. While Aaron and Serena struggle to unravel the machine's mysteries, Ensel Rhe confronts his past once more when he learns his daughter has come to Brighton, but in the company of one of his greatest enemies.
A race against time begins as Aaron comes to realize the Nullification Engine was never turned on for a reason, for once the machine reaches a state of full nullitivity, it will destroy Brighton and everyone in it.