It's not required to light the passages except that one where Dr. Charles Sternhart is to pick up the Worldstone and staff
when i try to use the shiprib with the hidden passage indy tell me first i need some light but i cant use the pedestal just beside because i dont have any orichalcum left
Thats correct, but you shouldnt be able to use last orichalcum for anything else than the light for opening door. :o/
