Y'ull Acib was a male Human member of the criminal syndicate Black Sun. A hardened criminal and among the galaxy's most dangerous, Acib had been serving out a prison sentence in the spice mines of Kessel when the New Republic released him and sixteen others on Coruscant to foster chaos. Going beyond the Republic's initial desires, Acib reestablished Black Sun on Coruscant, declaring himself Underlord and ruling over the group for a short period before being overthrown by Grappa the Hutt.