16+ and you dont lose any purples, i xfered my 16 star khan to alci and found this out, also the amount of stars to max stays the same as if it were the current hero ie. (36 stars to 18) xfer to from hero1 to hero2= 36 stars to 18 still. I have found the shortest route to max a hero is go offline usally when you have 10 or more purples and try ALL yellow heroes shortest route to 18 = goal. My khan took 96 stars to max....



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