E Is For Extinction - Secondary Mutation

Secondary Mutation

One of the major aspects introduced in the storyline was the official canonization of the concept of "secondary mutations". The term refers to mutants who possess multiple powers, a longstanding tradition of the X-Men books that had never been officially addressed by writers. The concept was mainly incorporated by Morrison to provide Emma Frost new diamond skin powers, allowing her to serve as a replacement for the recently deceased Colossus.