Mist Dragon by D K Holmberg

Jason has secured a tentative peace for Dragon Haven. With his control over illusion, and the Lorach threat thwarted for now, his time is spent preparing for the next attack, knowing the Dragon Souls will not be easily stopped.

An old ally to Dragon Haven returns, but Jason questions his motives—along with his techniques. Now Jason must choose whether to stop the Dragon Souls or save them.

Stopping Lorach for good might mean destroying the captured dragons. It’s a choice Jason fears to make, but doing otherwise means betraying those who have come to rely upon him.