Given the fact that there is currently a big disadvantage regarding the gears the two races' users have equipped, I think this suggestion will come just in place. I was thinking about how many guys there are sitting on piles of Ceranium of Medal unable to do anything with them, because they reached the absolute endgame. By adding Special Courier Pass (Eternal / Lv. 61-65) to shop or a new event, these will somehow be given a reason. Old players will have a reason to grind more sieges and medals and new players will have a reason to donate for coins, and trade for kinah or actually play the game and grind kinah and get the gear.
Think about it!:D