First you have to collect all 3 Map fragment They look like this First piece you can get from 3 Bosses in the frog pond Second piece from boss of Invasion event that happen on 3,6,9,12 Pm (GMT+8) at the village third piece from boss here: After you have gathered all of them, right click anyone of them to create a full map. Now you have the map, you need a key  key drop from   and wind plain mobs After u gather all of those, go find treasure now it's at   >  here What are the drops? U can get legendary if u're lucky~