Siena Blaze is a mutant with the ability to control and become magnetic energy at the cost of damaging Earth's electromagnetic field. After battling the X-Men, she found herself in another reality where she became a member of Warstrike's Exiles. Siena Blaze was created by Scott Lobdell and Chris Bachalo and first appeared in X-Men Unlimited issue 1 (June 1993). Although, like several other characters from this period, her first published appearance was in a preview in Stryfe's Strike File issue 1 (January 1993).