Sphere

The Sphere is a Dyson-sphere encasing a neutron star that was once in the center of the system that included Heaven. It is operated by the 235 Cult, a shady group of androids and polyhedroids commanded by Coin who seek to destroy all but one universe, making that universe a utopia of sorts.

The structure is about 10 kilometers in diameter, being made of metal with various rooms and chambers inside. The structure was built by Dezudes in -1235074, who made a deal with the 235 that they would labor in constructing the Sphere in exchange for protection and some of the structures energy output. The 235 stayed true to the agreement and the Dezudes became very advanced as a result of the technological advancements. Even with the 235's knowledge and power, the ship can still only travel at light speed.

In -997847, SATAN Timeline, the SATAN Wave passed over its system, sending it into the Void. When it entered the Void, some of the crew such as Octa, Icose, Pyra, and Look were scattered across Orates, known as Planet-O to them, for some reason. Later, Ms Tea advised Coin about a nearby green rift that would take them very close to Orates. They traveled to it, and arrived near Orates. There they deployed a massive arm that grabbed a small chunk from a larger chunk of Orates, the one that had all the lost crew and valuable Folder people, who are from a different universe and have portals that travel to others, and are valuable to the 235's plan of destroying every universe but one. They then teleported the crew members onboard. An argument broke out and Pyra was ejected into the void. Icose and Octa were sent back down to abduct the Folder people, but right when they were teleported a green rift opened up nearby, along with a small craft traveling at FTL speeds. Despite its small size, the pod, carrying Calinsia and Cestus, was able to completely obliterate the Sphere and neutron star contained within in a blinding flash of light. Ms Tea and Calinsia were killed from the explosion, and Coin was knocked unconscious within the metallic rubble of the structure. Cestus survived barely and fell to the planet in the ruins of the pod. Loads of other debris rained down across Orates and the island, destroying almost everything.

Later Steve, Papyrus, Sam, Mugman 2, Hollow Knight, and Blockman, who had jumped off a waterfall earlier, landed onto the ruins of the Sphere and are currently investigating it.