The Imperal Citadel
The Imperial Citadel is basically a gigantic floating castle in the sky. It would ebst be described like the castle and the land it was sitting on were ripped from the earth and put into the sky. In most ways it appears as your typical grey stoned castle, except it is more armed than the Marble Palace. Giant battlements sit in every available spot on the walls. Men constantly march up and down and a massive store of catapults and other military equipment sit on the inside. It is the main post for the Imperial Army and also hovers out in the bay to keep guard on the main trade routes. It can also fly at a relativley decent speed, meaning it can move to reinforce a city in trouble or attack and danger that might appear.
Where the citadel comes from though, no one really knows. Rumor has it, that on a search to locate a way to restore magic, Arias stumbled upon the citadel. Realizing that no one in Innes posses teh magic to create something like this, he figured out how to control it and presented it to the king as a gift. The king was so well pleased he gave command of it to Arias and stationed it in the bay to keep watch on important cargo moving through the kings trade lanes.