This is the group,formed by Madelyne Pryor, which debuted in Fraction's run on Uncanny, then recently returned in the pages of Brian Wood 's X-Men led by Lady Deathstrike/Arkea
After their last appearance, only the newly-resurrected Maddie and Selene remain, with the former intending to form her own sisterhood. With Wood promising they will be a continuing threat, who do you think should join next?