[The Rider]

actually your code was making the ammount of might runes always 1. it required a little tweaking to add 1 rune and it looks like that:

local rune_might_count = Logic.hero_lu_item("rune_might","count")
                Logic.hero_lu_item("rune_might","count",rune_might_count+1)

but thanks a lot for the help, now it works