The hidden areas of Trayus Academy are just more hallways that look just like the others found in that area. In the Trayus Proving Grounds area, there is a hidden row of cells just like the other that you find in that section, along with a meditation chamber. The Trayus Crescent, which is actually called the Trayus Prison, contains much more. This is the area in which you originally found at least 3 members of your crew being held in cages. You also found a large mine field, along with a dead jedi corpse that contains a Hurrikaine crystal.
The screenshots below show the map entry naming the "Trayus Prison", along with pictures of two improtant areas that were cut from the Trayus Prison area. i didn't include any pictures of the Trayus Proving Grounds becasue that area only has a few hallways cut out and isn't very interesting.
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Whats The location Of This Dead Jedi/Trayus Prison example:905mal