Thanks for the info
I am delighted how they are progressing and how regularly you inform about them
What is the currency? Typically, the currency is the currency used to trade, thanks to the currency you can buy, sell and even exchange with other players. A good example of currency is PoE Orbs, below I put a link to the full list of PoE Orbs
http://poeorbs.pl/1_2_lista-poe-orbs.html
There is full list of PoE Orbs, and actually this is PoE Currency