They have battle tiers where if you have the right runes on the right hero's, your going to be top tiered. In that game, I think I have 9 5*Nat's, and like 60+forges. I gave it to my brother in law almost 9 months ago because I couldn't figure out which hero's would be best to go for. Rune system there is quite like dragonsoul, just a different game. They have specific spots to farm specific runes, we have chapters. Runes in shops, same. Biggest difference is the fusing a hero for better hero's. Last time I looked into it, there was a new hero that came out, like a family tree. You need to sacrifice 3-5 hero's to get a part of him, then later in the month, you sacrifice more. The fire part seemed best route. He had fire, wind and water. The grind my b-i-l told me was he played for 16+ hours every day, spent 600$ and took him almost 3 weeks to get all the parts. That hero was the strongest in game and after he built it, it showed. As for runes, maybe a whole different take needs to be done.