Still don't keep what it mean. Help anyone?
Go to Heroes altar and you would notice that on the top left of your hero's icon there is a star with a number. The number represent the star level, thus a 6 star hero would mean a star level of 6. To upgrade your star level, you would have to train the hero till the max level at that star level and upgrade them. For example, the max hero level for a star level of 1 is 20, and a star level of 2 is 40 etc.
(84884338) replied at 9-2-2013 08:29 AM
Thats what i thought initially but my achievement shows 5/6 and I don't even have a 6 stars heroes.
That would indicate that you have a 5 star hero so far, in other words one that is at least level 80+.