Ebonsteel Knight is an outfit style, included items are helm, pauldrons, cuirass, gauntlets, girdle, greaves, sabatons, bow, dagger, greatsword, shield and staff.
Location: The armor pieces of the Ebonsteel Knight outfit style can be obtained from killing any of the named champions in the Imperial City Sewers. The weapon pieces can be purchased in the Crown Store with the Ebonsteel Knight Arms Pack (limited time only).