purify an item that in the initiative turns out golden. then you refine everything you can to that equipment .... other ways is to fasten 3600 cupons in greate plates. you get 500 and more keys per week you earn 66k in keys .. use 60k to buy 300 keys per week in a month you will have 1200 .. throughout the month you will find free keys for completing missions obtaining 2100 keys you will get 2 golden essences .. 140 keys for a limited time. ramdom items