The New Mutants #30 : The Singer & Her Song (Secret Wars II - Marvel Comics)

Shadowcat uses Illyana's Soulsword to transform her from the Darkchilde back to her normal human form, manifesting Magik's armor in the process; The kids return to earth from Limbo and once again head to the mutant arena to rescue the captured Magma and Sunspot; They are secretly spied on by the Beyonder but Rachel senses him and tries to communicate; Dazzler and Shadowcat infiltrate the Gladiators but are captured by the one who is actually controlling events in the arena, the former New Mutant, Karma.