👉Buy the feathers to upgrade your wings to grade 21 at the mall shop (bound/unbound diamond).

👉To go up to grade you will need to buy the items in order, first T30, then T40, T50 and last T60.

👉The item T30 and T40 can be bought with bound diamond, it costs a total of 14,000,000 Bound diamond.

👉The T40 and T50 are purchased for a total value of 2,500,000 diamonds.