Somebody know how to get the knowledge of Eliza from Tatar??, I follow all the main quest of valencia but still i didnt get the knowledge that requires to complete the quest, I got the key from Tatar and combine with the box... PLEASE KINDLY HELP...

You have to buy beer from the market (5) and give them to tatar. There will be another option in the "chat" with tatar when you go to him with beer. Then get the knowledge. After you may have to steal the key again from tatar if you dont find the key in your inventory to open the chest. Then arrange key and chest (-) in the inventory and open it. Then give that diamond thing to Afauru. 

You have to buy 5 beer from the market and give it to tatar. There will be another option in the "chat" with tatar when you give him the beer. Then  you will get the knowledge. 

When you have the treasure chest and key, remember to untick the auto arrange feature in inventory and then place key and chest next to each other. FIRST the chest and then the key :)