Love this one to bits. The world building is fantastic: rich, and dark, and wonderful. Lyon was a wonderful character -- crippled by his own past, and tormented by his memories of dark magic. And Tobin was a perfect hero: honourable, steadfast, and loving.
And Xan...wow. Just wow. I think his emotional journey was even more satisfying than Lyon's. Just so full of sadness, and regret, and just beautifully realised.