The Starry Sky Gift box is an item obtained not long after you begin your journey. Every level it gives you new items to help you, which ranges from potions, stat items, the armor gachas (every 5 or so levels) and more. The highest level the box will go up to is 35, so after level 35 you are dependent on other players, ncp's, or yourself to make new armor, weapons, and so forth. Items from the Starry Sky Gift Box are also only useable up to level 36. When you hit level 37, those items that are noted only useable up to level 36 are useless and end up taking up precious bag space.