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Conjecture was made that he had stopped following the will of Cyttorak, thus Cyttorak sapped him of some of his power. He changed his armor to Black and gold to more closely resemble the color schemes of the X-Men costumes at the time, showcasing his desire to repent and the role that the team had taken on in his life. Recently he has gone back to his original armor. I have not read the past couple issues of the latest X-Men arc, so this info may be a bit dated.