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We present the Dark Energy Survey (DES) discovery of DES15E2mlf, the mostdistant superluminous supernova (SLSN) spectroscopically confirmed to date. Thelight curves and Gemini spectroscopy of DES15E2mlf indicate that it is a Type Isuperluminous supernova (SLSN-I) at z = 1.861 (a lookback time of ~10 Gyr) andpeaking at M_AB = -22.3 +/- 0.1 mag. Given the high redshift, our data probethe rest-frame ultraviolet (1400-3500 A) properties of the SN, finding velocityof the C III feature changes by ~5600 km/s over 14 days around maximum light.We find the host galaxy of DES15E2mlf has a stellar mass of 3.5^+3.6_-2.4 x10^9 M_sun, which is more massive than the typical SLSN-I host galaxy.

DES15E2mlf: A Spectroscopically Confirmed Superluminous Supernova that Exploded 3.5 Gyr After the Big Bang