Siryn-Ela é uma mutante filha do falecido X-Man Sean Cassidy.Ela apareceu primeiramente na revista da Mulher-Aranha e logo depois foi incorporada a revistas ligadas aos X-Menpossui os mesmos poderes mutante que seu pai, Sean Cassidy (Banshee).Grito Super-Sonico,Audiocinese,Vigor Sonoro...
Siryn Name - Theresa Cassidy Parents - Maeve & (Banshee) Sean Cassidy Cousin - Tom Cassidy (Black Tom) She was also pregnant for a time from Multiple Man, but the baby turned out to be just a duplicate of himself.
Siryn by ChillyPlasma.deviantart.com on @deviantART Theresa Maeve Rourke Cassidy is a fictional comic book superhero appearing in books published by Marvel Comics, usually those belonging to the X-Men family of titles. Debuting under the codename Siryn, she later retired the name and started using Banshee, in honor of her late father, Sean Cassidy, who first used the alias.
Before X-men, Banshee, the heir to both a small fortune and a castle in Cassidy Keep, Ireland, married Maeve Rourke. While away, she gave birth to their daughter, Theresa Cassidy then she died in an IRA bombing. With no contacting Sean, his cousin Tom took care of Theresa. Sean returned to his wife’s death. Before Tom could tell him of his daughter, Sean lashed out at Tom with his sonic scream breaking his leg. Tom swore revenge and never told him about his daughter, raising her himself.