the darkness portal in order to open them means you choose the dark path organization 13 can use them cuz they can use darkness but theres light portals two like when TAV opens them to travel to other worlds my question is why cant aqua open a portal in the ROD when she travel all worlds using it is it related to her keyblade but she already have a keyblade it doesnt matter if it wasnt her key she just need swing it and open a portal