Marvel: Miniature Star

Kuan-Yin Xorn (Xorn)
The star in Xorn's head allowed him to emit the same energies a star does. Most notably, he gave off electromagnetism. Xorn's sun was capable of emitting blinding light that could instantly incinerate another being. Xorn was capable of reversing his stars natural state. That is, Xorn could cause his star to collapse in on itself to form a black hole.