Advanced refines are cheaper in the treasure of the sages though. If you still havent passed medium thread AND refine level, you can buy mission gift boxes and get charms- that event has similar efficiency as lucky board. As I said though, only if you havent passed that level, since after that mission mobilisation box rewards value severely diminishes. Other than that, few adv threads wont hurt, since currently theres no other way to obtain them other than 1per 4days from space time shop.