I allready did that, that no helps
i'm talking about increasing the chance to find them
i spend days on the areas with rare and legendary treasure and still haven't got any
The treasure finder can be upgraded through fusion.
The higher the upgrade level, the faster the treasure finder bar fills when you win battles.
Once full, it will start influencing your chances of obtaining a rare, unique, or legendary treasure.
The more favorable your odds, the redder the bar will turn.
All adventure sites have an icon graphic with the items that get dropped there. If there's an infinity sign, it's a common item that you can get without limit. If there's a number, then you get exactly that many of the item and no more, and that icon will disappear afterward. Those are the rare/legendary/unique treasures it refers to, and the treasure finder increases the drop probability of all of them. Eventually you will clean them all out and the finder will no longer do anything special there.