Lind had thought about several points of attack if he had to start it against the Starbreaker Empire. He had been forced due to first Gel then the force that came looking for her.
The moment he killed that first thrall, his path was set. He had spent the last 2 years causing havoc with a purpose. He watched and evaluated those that came to investigate for thralls, strength, and other factors.
Thus, when he had to start attacking, it was systematic and without mercy. Every village had a few thralls and he killed them all. It was simply as all he had to do was lace the air with his harmony.
No one even saw what happened until the first thralls burst into flames. Further, any Fiend traps, weavings, and all artifacts fractured in less than a quarter of a day. Chaos was unleashed and strangely, he felt better than he had in a very long time.
