WARNING: The following article contains spoilers for RWBY/Justice League #7, on sale now from DC Comics.
RWBY/Justice League -- DC's digital-first crossover limited series placing alternate versions of its most popular heroes in the world of the Rooster Teeth animated series RWBY -- has just wrapped up its serialized print run. And now that Remnant has its own proper Justice League, they'll need a place to call home.
In RWBY/Justice League #7, by Marguerite Bennett, Meghan Hetrick, Hi-Fi, Gabriela Downie and Becca Carey, Team RWBY and the newly-formed Justice League manage to subdue the villainous Starro the Conqueror and break its telepathic hold over the denizens of Remnant. With Starro being imprisoned and banished back into outer space, the relief effort soon begins.
Team RWBY and their fellow hunters are tasked with clearing out the remaining Starro-possessed Creatures of Grimm, while Clark Kent/Superman leads the charge in returning the formerly-possessed civilians to their homes. Elsewhere, Bruce Wayne/Batman carves out a better living situation for Barry Allen/the Flash's family, as well as converts his mansion into a home for youth in need.
Moreover, now that Remnant knows of the multiverse, it will need guardians to protect it from any future extraterrestrial threats, as well as a place for them to master their fighting skills and respective Semblances. As such, Jessica Cruz/Green Lantern oversees the construction of a new home for the Justice League: the Watchtower.
Everyone plays a part in making the needle-shaped, space-based headquarters a reality, from Arthur Curry/Aquaman and Victor Stone/Cyborg to RWBY's own Weiss Schnee and Pyrrha Nikos. Then, there's the issue that Dust doesn't work in outer space, a fact that caused the accident that turned Victor into Cyborg in the first place. Fortunately, Jessica managed to create a small batch of Dust that will work just outside Remnant's atmosphere, though no further.
In the world of RWBY, the Watchtower is a school, of sorts, though not quite on the same level as Remnant's four major academies. After all, it only has seven "students": Jessica, Clark, Bruce, Arthur, Barry, Victor and Diana Prince/Wonder Woman. Jessica explains that a more accurate term to describe the Watchtower is "sanctuary -- a safe haven."
"It will have only seven students," the Green Lantern explains. "And each student will be a teacher… a guide… a guardian… and a friend to all the others. And though it will seem far away, you can see it in the sky each night… and visit us whenever you wish." True to her word, the Watchtower glows as a green beacon in the night sky, just below Remnant's iconic fractured moon.
Of course, fans of DC's main comic book universe will know that the Watchtower is, for all intents and purposes, the Justice League's true headquarters. As opposed to the public-facing Hall of Justice -- which resides in Washington, D.C. -- the Watchtower is a satellite that orbits the Earth, well away from the general public.
Introduced in 1997, the original Watchtower (created by Grant Morrison) was situated on Earth's Moon, though was eventually destroyed. In 2006, DC introduced a new Watchtower to its comics universe, this one being a needle-shaped satellite designed by another Green Lantern, John Stewart. This incarnation is technically the Justice League's second satellite base, following the original Justice League Satellite that was introduced in the 1970s.
That said, the satellite base established in 2006 actually owes its concept and design to the Watchtower seen in Cartoon Network's 2001 animated series Justice League. A new and improved Watchtower was later seen in the follow-up series Justice League Unlimited, which premiered in 2004.