Pass location
After completing the above mission, talk to the character with an exclamation mark above his head in the swamp city, enter the Sky City mission, and teleport to the exchange point: go out and walk directly to the lower right to the merchant with the light bulb sign to take the pass. As for the general map of the Sky City in Figure 3, just go straight to the right after exiting the exchange. There is a mission and a plot when entering the Sky City. The mission is to deliver the potion to the mansion. I dare not comment on the plot.
mansion
The route is: After getting the pass location in the picture above, just go left. The missions are delivery and infiltration (stealing something valuable). The infiltration mission is almost the same as the swamp mission. They both go in quietly in the middle of the night. However, when you go in, you walk through a big hole (there is an exclamation mark), and when you go back, you also walk through it. The way in (the gate is guarded), until you wake up in the morning and learn that the potion transported from the Sky City has been intercepted, and the owner of the mansion asks you to investigate.
At this point, the content related to how to obtain the Pass to Destroy the Warrior Princess is basically finished. I hope the above content can inspire you. But there are many ways to play the game, and it is also a good choice to choose a way to play that makes you happy and enjoyable.