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We propose an in-depth study of 1 Super-Luminous Supernova (SLSN). SLSN are >10times more luminous than ordinary SN and represent the deaths of the mostmassive stars in our Universe. Their extreme luminosity requires exoticexplosion mechanisms and sources of energy whose nature is unclear. Here wepropose a focused XMM program to map their X-ray emission down to unprecedentedlimits as part of our multi-wavelength effort (UV optical/NIR radio hardX-rays). The final goal is to: (i) Constrain the energy source of SLSN (ii)Map the diversity of the pre-explosion evolution of their progenitors. (iii)Constrain their possible association with Gamma-Ray Bursts. Our study opens anew window of investigation on the physics of the most powerful stellar explosions [truncated! Please see actual data for full text]