Character Name: Theresa Rourke Cassidy
Codename: Siryn
Alignment: Good
Powers:Siryn is a mutant who possesses sonic powers similar to those of her father, Banshee, although she is able to use her powers in ways that Banshee apparently cannot. Like her father, she has the ability to emit high-decibel "sonic screams" to create various sonic effects with her vocal cords. She can also vary the pitch to deflect projectiles, and she even used it to deflect lasers once.[volume & issue needed] She possesses an enhanced sense of hearing and can use her voice for echolocation to detect objects. While screaming, Siryn is able to fly at the speed of sound. Siryn has especially potent sonic attacks. She can shatter objects; project concussive blasts of sonic force (a "sonic lance"); or cause immediate pain, nausea/vomiting, and unconsciousness. She has shown a degree of resistance to what would be harmful and painful sounds and vibrations to normal humans or mutants without sonic-based powers.[23] She also possesses psionic powers to create a force field that protects her against her own sonic vibrations to assist her ability to fly, and to help direct her sonic powers. Unlike her father, Siryn is able to influence and control other human beings with her sonics, as well as cause them to enter a hypnotic state. Siryn can also cause the intended person to fall in love with her without regard to gender or sexual orientation and carry out her wishes and commands, like mythical Sirens.[26] Siryn once utilized this ability on Spider-Man, forcing him to divulge the truth about the Decimation of the mutants.[27]
Bio: While Sean Cassidy was working on a deep undercover mission for Interpol, his wife Maeve gave birth to their daughter, Theresa, at Cassidy Keep, County Mayo, Ireland. Not much later, Maeve died in an IRA bombing. With no means to contact Sean, his cousin Tom took care of Theresa. When Sean returned to learn of his wife's death, he was devastated. Before Tom could even tell him of the existence of his daughter, Sean lashed out at Tom with his sonic scream for not having taken better care of Maeve. While Sean flew away in anger, Tom fell into a chasm, breaking his leg as a result of the attack, which left him with a limp. Angrily, Tom swore to make Sean pay and vowed to never tell him about his daughter, raising her himself instead.Tom (now known as Black Tom) would raise Theresa as his apprentice in his criminal activities. While still a young teen, Theresa accompanied Black Tom and his then-partner, the Juggernaut, to San Francisco to assist him in his crimes. Here, employing the name Siryn, she aided them in a theft of vibranium, and battled the original Spider-Woman and several of the X-Men.[1] This conflict ended in Black Tom's temporary capture. While in custody, Black Tom exonerated Theresa of responsibility for her crimes and wrote a letter to Sean explaining who she was.[2] The X-Men brought Theresa back to their headquarters, where she was joyfully reunited with her father.[3]
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