Each time you unlock a new material you get a coin (only once), and starting on SAND, you get one on every Reforge after it. Also the spaceship gives away coins at low rates.
5 star hero too rare, it have very low rate on the summon. number of skill on hero is obsolute random, you have 100% obtain 1 skill when hero up to lv 2, 2rd and 3rd will appear on later level, but it random
Productivity of Upgrade Screen was improved.