The Lord Sorcier

No — The Lord Sorcier is a prequel novella and works as a standalone read. It was originally released as the bonus story printed at the end of Half a Soul, the first novel in Olivia Atwater's Regency Faerie Tales series, and tells an earlier chapter in Elias Wilder's life.

It's Elias Wilder. In the Regency Faerie Tales series, England names its own royal court magician "the Lord Sorcier" because France already has one — and this novella tells how Elias, a low-born magician serving in the ranks during the Napoleonic Wars, comes to earn that title.