I would like the rune have a max cap based on hero.
2-5* runes only for 2-5* heroes
+3 Runes only for Green Heroes
+6 Runes only for Blue Heroes
+9 Runes only for Purple Heroes
+12 Runes only for Orange Heroes
... perhaps we would get +15 for black?
I would also like to have runes from start and from chapter 1+