Additional Info
This was part of the Dark vs Light bosses, which were removed from the game in Update 7.0. You could get this reward by defeating all the dark-side bosses in the open world.
Banner: Dark Side (Style 1) SWTOR decoration, screenshots and information!
Hook: Wall Large (Purple Rectangle): The Banner: Dark Side (Style 1) decoration fits into a large purple rectangle wall hook.
This was part of the Dark vs Light bosses, which were removed from the game in Update 7.0. You could get this reward by defeating all the dark-side bosses in the open world.