After a sojurn through the planes, eventually bursting from a misused bag of holding, Uzra Planeswalker placed Triagral Island on the planet of Mystara.
It is ruled over, in joint with the Commonwealth of Triagral on Arda, by Rod Halfking.
The Island has three major cities. It is home to the Skywood forest, from which airships are built, and enjoys dominance of the skies in Mystara with the biggest and fastest airships on planet. The available customization and multiple styles of drive and trim is unparalleled on Mystara, where other airships are generally only recreations of antique pattern: large but slow. Mystara also maintains an Airship Marine force, the Skybax, equipped with impressive custom-built powered boarding gliders. The Skybax force stationed on Arda with the Commonwealth of Triagral is training the Imperial Marines and Duchy Eltán's Air Operations group.
Its great shipyard has slips for six airships to be built at a time: five medium hulls and one large capable of building a frame comparable in size to an average SpellJammer.
The island includes great chasms, through which the Hollow Earth inside Mystara can be accessed. After early difficulties and lost ships, airship navigation of the gravity shift was reduced to a procedural challenge, and trade routes within the Hollow Earth were established. Coupled with trade routes on the surface of Mystara, this represents an enormous trade empire. Non monopolistic, it attracts many immigrants with good paying jobs. Because the technological edge is so profitable, the island's thieves guild has transitioned to a primarily counter industrial espionage role.
There is the potential of an export/import market exchange with the organized market being imperially managed on Arda by the West Arda Trading Company, currently limited by a traffic choke-point through the mirror portal in the Great Imperial Pyramid. If this point was bypassable for bulk transport, the two shipping empires could be of great mutual profit to eachother.