Intrude into Sky City -
Go to Wudang Gym and find Taoist Wuji (20,18). if you are not Junior God at
level 200 or above, you will enter into fight with level-900 Ostrifons.
If you win, you can enter the Sky City.
If you are Junior God at level 200 or above, you can enter the Sky City
directly by right clicking on Taoist Wuji, then "Break into the Sky City".