Opal is a Siren. Her main power is Mind Manipulation: Telepathy, reading desires, erasing memories, or inflicting psychic pain. So, if you have an enemy that you need help in evening the score? Opal is the lady you need. Not all Sirens have the same abilities and typically they are known for their mesmerizing voices. Opal is different. I have even noticed some signs of teleportation. Let's just say she let's me know if she doesn't like her surroundings! Always have her with you with her travel vessel.