“Into the Light” (Shadows of an Empire book 3) by NE Riggs
Riol and his companions live in the shadows. They can sneak into anywhere, retrieve any information, kill anyone. They have never suffered a setback before. In her lust for the karyon, the empress twists their minds before sending them south. Riol loses everything he loves. Only the mission remains: bring the karyon back to Daranvirmor and kill Banof.