So I just realized my 3* heros are all maxed level but the special skill never maxed out. Thus I cannot put emblems on them. I have used countless feeders to try and max the special skill but it never seems to go up. How do I get the special skill maxed so I can put emblems on them?
Feed like color either 10 1 stars or 5 2 stars to get 100% chance of leveling up the special.
Edit: has to be done for each leveling of the special, so if it is at a 6 you would need to do this twice.
As @SupremeAlienRaptor says, you keep feeding them heroes. Note how the % chance of increase improves with each feeder you add
Matching colours works best