The Nullifier's Dream

From the introduction:

After years of obsessive, curiosity-driven research, the elfmarked wizard Hecta Quisse was able to track down and claim a copy of the Nullifier’s Lexicon in Kel Azjer. Needing some privacy to effectively study the tome of Void magic though—and to stay ahead of the Northlander Ragnarok cult voidspeakers, who wouldn’t take their possession of the grimoire kindly—Hecta resettled in Dornig, securing a tower on the fringe of the Tomierran Forest: far enough away from the forest to stay out of notice of the church but close enough to tap into one of the more powerful ley lines for the mage’s various topics of research.