SHUT YOUR COMMIE MOUTH , T H E N O T R E F E R E N C I NGTHESUBYOUSHILLBOTDONALD IS A PLACE OF ENLIGHTENMENT ! ! s <| sep |> Don ' t worry about fusion right now but the jist of it isEach stone can be powered up , up to 15 times Current power level is denoted by the n next to it Where n is the power level . At every 3 ranks the stone has a chance to evolve so at power levels 3 , 6 , 9 , 12 and 15 . Now stones also have Grades similar to players but they only go from 14 stars . Now when you fuse stones you need 5 stones of the same grade , e . g three 2 star stones and two 1 star stones cannot fuse . When fusing you will notice a number in the lower left corner . To the left line and to the right of that is another number . The bottom number is the goal of power up you need on your stones , the left most number is the current number of power ups your stones have . . The right most is the rank you need to hit to fuse . In the link provided you can see 47 is the number of power up that my stones are at . The sum of all stones is what contributes to the total that is needed . So in my case I would need all those stones to be 15 to reach the requirement of 75 . Lower ranked stones require less investment You can see in the first picture , I have 3 dark stones and two thunder . Only the element of the middle stone is important the rest can be fodder . Rarity of any of the stones is irrelevant . Fusing will give a a new spirit stone of the same color as the centre stone in the fusion . It is guaranteed to be rare and of a grade higher , so 5 2 star stones fuse to become one rare 3 star stone feel free to ask anything else .