I'm here posting my second message to explain now you to how upgrade our monsters at their max level.
I start telling you that you can use this kind of strategy on your most valuable monsters ( for example a lanval as i did).
You will need a lot of cristals that you can obtain by selling weak rare monsters 1 or 2 stars( even weak epic if you have)or rare monsters, 3 or 4 stars, especially at 70 to the bazar exchanging these for crystals.
You can obtain crystals during the events too.
Now power your lanval with 50 crystals( ten of every type) and do the same with the other 7 lanval. Fuse them at their max level and you will obtain the OPE(Crystal Perfect Evolved lanval Lizard Cavalier II for me).
Here a link in wich you can control the stats of your and other familiars in the bazar. https://docs.google.com/file/d/0BynAU...edit?pli=1
If you are starting the game add this code at the end and you will obtain a special monsters plus silver coins and other stuffs ;) 7A3gFM