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

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