How do i get special keys?
Earth - Chest inside Chief's Hut on Juraika
Star - Angela's Bar on Vedan (If you don't get it in Chapter 6, you have to wait until Chapter 8 for another chance). It requires the Earth Key to open.
Sun - Chest in Johannasburg on Rosa. It requires the Star Key to open.
AFAIK, there are no other special keys gtjio - 12 years ago