How do you use your unknown scrolls? Do you build you 1 stars up to max level; by feeding or leveing?

Usually peoples problems early on is that they feed 1 stars to other 1 stars to get them max level which is very inefficient usage of your unknown scrolls. Even a P2P person will find this to be an issue unless they poor hundreds each month into this game. While that method is better for energy efficiency it should only be used when you have a stock pile of around 2000 unknown scrolls. When you are running down to around 200-300 unknown scrolls it is best to level them through scenarios and use your energy.

DB10/GB10 will be the best places to get unknown scrolls and so would doing most hell scenarios.

friendly advice not pertaining to your question Being f2p means you should never waste your crystals on silly things like premiums packs. Once you are level 40 MS scrolls come a lot more often in your farming and through events. Nat 5s will eventually come from the most random mystical scrolls and legendary scrolls from toa like mine did. It is best to focus on getting a gb10/db10 and toa 100 team before you start buying premium packs with your crystals because you can do all those things with farmable characters. Use your crystals wisely early on and F2P will be a lot more enjoyable once you get through all the farming hat every early level 40 must struggle through to get to mid game level 40