Abaddon is a collective of five regions that we are able to RP in within this universe.
The regions are described vaguely but feel free to add more detailed areas (as long as it is realistic and true to the area). Keep in mind that the Sky is always dark with blue "stars" (they're actually other dimensions and this is common knowledge) and there is a moon in the sky similar to that of real life Earth's only with a blue tint.
Diana is the main city and the capitol of Abaddon. Beneath that is Agritera which is only accessible by crossing the labyrinth.
One you pass that you enter the main plaza of Agritera where you can enter MadCross through The Hollow Cavern.
From here you have to cross the entirety of MadCross to the otherside to reach Ascension.
Ascension will lead you to an island paradise known as Kwaon. They refer to this as Descension due to having to travel down to Madcross from their peaceful island.
From here you can use a Pod of the Empyrean to teleport to Altostratus which is a constantly moving city in the clouds. One there you can use also use the Pods to return to Kwaon or instead go to Diana which has the same pods that allow you to travel to and from Altostratus.
However, this teleportation only works from the Diana to Altostratus and back and from Kwaon to Altostratus and back. This means there is no teleporting from Diana to any other city and vice versa.