Order of the Black Sun

The Order of the Black Sun was a group that waged a time war against the Time Lords, the first time war that the latter group ever fought.

Membership
Several different species, some near-human, others only vaguely humanoid, made up the Order. They wore capes and black unitards with a logo on them. (DWM: 4-D War, Black Sun Rising) They used hand-held black orbs as the focus for blasts of power. (DWM: 4-D War)

Aftermath
Long after the time war, a member of the Order of the Black Sun would serve as a High Evolutionary. (DWM: The Final Chapter)

Behind the scenes

 * Alan Moore mentioned that he intended the Order as a reference/tribute to DC Comics' Green Lantern Corps, identifying them as originating from Earth-5's reality (as opposed to DC Comics multiverse, whose main realities were Earth-1 and 2).