These misterious crystal comes from the choosen... U can change them on the city capital and get for the collecting city reputation. You an get it a lots of way: 1:Usin the efril Replicator, what u can purchase after u get 1000 Relic Seeker reputation. 2:There are some event, which can u give u efril if earned enough reoutation.(Higland of the Terror after 500 Repu, Adobe of Decay after 200 repu) 3: Can be acquired from quest : An uncooperative Chest 4:From gnome caskets 5: And from Stash pots.