A system around a true arcane star found within the abyssal plane and proves impossible to effectively map since the abyss does not have true planets. Instead featuring winding pathways between landmasses floating arbitrarily in space, though the typical star map is used to focus on various clusters in the area.
Moncayo is a colossal body of fresh water the size of a planet, though is shaped more like a disc with its edges just expelling water into the infinite abyss of space. Underneath the waters is an immense reef network with some active vents spewing a blue luminous liquid that life clusters around. While Moncayo is the capital of the system, visitors are advised to stay away from the edges where violent currents could rip them out into space. However, a hundred miles inward of the edges proves to have a stable flow of water. Part of this cluster's oddity is that it never seems to run out of water despite how much just runs off the edge, a phenomenon blamed on it being a lower plane with loose rules. Within the sea of Moncayo are tunnels of air and forest trapped within bubbles of atmosphere that can be navigated quite easily and inside these air pockets is the great Moncayo City.
The alpha and beta clusters that are just beneath Moncayo are shielded by the constantly falling water around the disc and are impossible to see from afar. The alpha cluster is tied to the elemental plane and a constant swirl of burning gases that keep Moncayo and the beta moon warm. Perhaps a bit too much so for the beta cluster nearby as that is a vast arid landscape that is somehow surrounded on all sides by falling water that protect it from the arcane star.
An actual spherical planet, which is rare on the abyssal plane. However, it is hollow with its own moon clusters being erratic pathway formations on the interior. The sphere has no exterior, it can be passed through as open space and will not show up on any scanner. The only access to 250 is through tunnels coming from 250-1 Beta or 250-3. By following these pathways you will be suddenly inside of 250-2, whose seas glow with the light of the nearby arcane star coming from beneath them. If you dive to the bottom of these seas you will land right in the star itself. 250-2 is one of the Abyss' great examples of being a lower plane, it has no true position in space yet is very clearly in a specific spot of seemingly empty void. It's alpha cluster is a golden world by Sol standards though is still an oddity. It appears as if it were a jungle that grew out of a desert, most of its plants are suitable to extremely dry and warm conditions. Which is strange because it rains frequently yet they are still growing out of the desert sand. The beta cluster inside of 250-2 is at its very core, as if it were the center of this spherical world. It is just a floating sphere of freshwater that rains throughout the inverse planet sporadically based on the activity of the arcane star rather than anything else that would make sense.
This icy landmass is incomprehensibly vast but thin. Forming a hemisphere that engulfs everything else in the system and hides the arcane star entirely from a certain direction. It is only seventeen thousand kilometers thick, which is paper thin compared to its surface area. On the interior of its shell is the cluster known as its alpha moon, an expansive mass made up of more gemstones than traditional rocks. This clustered activity exhibits a property of disrupting all forms of scanning technology and veins of these arcane infused gemstones run through 250-3's interior surface that makes the entire Cayetano system impossible to scan from a certain galactic direction.