[johan osterman]

It is not cumulative, turns out though that I was way off on the numbers. Which became obvious after I thought about how often you do get heroes even with negative luck scales. Base chance is 3% +1% per luck scale. So with luck 3 you still have 0.94^30 appr.=29% to not recieve a hero after 30 turns. Sorry about the misinformation I probably jumbled the numbers with the pop growth numbers.