Sector 1

Sector 1 is one of twelve sectors in the space colony known as Heaven's Fence. This sector contains six planets in total including Omega, it's capital planet. Before the Mage War, the governing mage of this sector was Althaddeus Favor.

Brief History
It is implied Sector 1 is located at the heart of the Fence, right in the middle, due to House Atlantic being "center of Heaven's Fence". During the Mage War, Favor initially allied with Wilhelm Ryan who was trying to take over the Fence in its entirety. During the "War of the Western Third," Ryan visited Favor in his stronghold of House Atlantic and though specifics are unknown, Favor was never heard from again and Ryan began using House Atlantic as his own. Upon the end of the War, Ryan declared himself "Supreme Tri-Mage" of all the Fence.

Notable Planets
As mentioned, this sector has a designated capital planet with five follower planets, for a total of six. We do not know of all of these planets, just it's capital planet called Omega.

Omega
Probably the most well-known planet in all of Heaven's Fence as it is the home of the Supreme Tri-Mage and headquarters to his United Red Army. That said, it's most notable city, it's capital city, is Apity Prime, where the stronghold of House Atlantic sits. Apity Prime is a huge metropolis-like city and so within it it has districts or subcities such as Apity Central. Nearby Apity Prime is also the city of Kalline.

Apity Prime
Apity Prime is Omega's capital city. It is a huge city and has subcities or districts like Apity Central and is described as having "grimy air." After the Mage War was over and Ryan reigned Supreme, his Red Army held a victory parade in which protestors were crushed by Red Army tanks, but the majority of people did not bat an eyelash at this. Ryan followed it up with a special drink that he sprayed all over the city which caused what could only be described as delirious jubilation. People lost all inhibitions and eventually—unintentionally—ransacked the city. It was also the site for a demonstration after the KBI had been dissolved. Headed by Ryan's General Mayo Deftinwolf, speeches were given about the resilience of Ryan's forces. It was interrupted by Dr. Leonard Hohenberger who brought a pulsar gun to threaten the General and instinctively, Deftinwolf shot him dead. The crowd, of course, cheered for the Red Army had done what it continued to claim it would do: protect them from any and all threats.

House Atlantic
Of course, one cannot talk about Apity Prime and not discuss House Atlantic. Originally owned by the governing mage of Sector 1, Althaddeus Favor, who willing joined Ryan's side in the Mage War, this massive structure sits on a hill within Apity Prime. The stronghold features five towers, the lead of which has three additional towers sprouting out of it. It is in the tallest of these towers (called the High Tower) that Ryan resides. The High Tower is mostly made of glass allowing Ryan a mostly unobscured view of the sky above Omega.

House Atlantic has been destroyed three times. The first was at the end of the year of the Black Rainbow when KBI inadvertently infiltrated the tower, and subsequently destroyed it both inside and out causing its complete collapse. KBI was never heard from again and the Black Rainbow dissolved the next day. Ryan did not wait long to rebuild House Atlantic and we're not exactly sure how long it took for it to be completed, but it would be another thirty years or so before it's next destruction. The rebels had made their way to the stronghold after Ryan's declaration of destruction of Shylos X and other planets. They brought the fugitive Prise with them and a great battle ensued. Ironically, The Crowing also made his way to this battle. The Prise, emboldened by the Crowing's presence, charged on Ryan in his High Tower, but when they got close, were seemingly disintegrated. House Atlantic seemed to have been powered up by this and began to shift and transform into a giant robot-like figure. The rebels ultimately decided to retreat, though as they boarded their ships, the robot generated a giant energy blast to destroy them. The Crowing stepped in between them and used his power to create a large shield that bounced this energy back on it, destroying it for a second time.

It was rebuilt just a few days later, and how is still unknown. Eventually, it was destroyed for its third and final time.

Kalline
Kalline is a small city very loyal to Ryan and the Red Army. It was chosen by Ryan to be the testing ground for their dragonflies carrying their new serum, the Aeonstar Virus. This was highly effective as in just a few hours, the entirely city is overrun by mutated citizens.

Trivia

 * Althaddeus Favor probably became an Onstantine Priest.
 * The Althaddeus Trade Route is named for this famed mage.