The RPG genre seems to be right now in a very sweet moment on the mobile platform. One of the most cloned RPG games this past year 2015 was Heroes Charge. With its new approach to the genre and to the freemium itself, it created a small revolution among RPG games (and also some controversy).
It is an excellent game in a number of different areas, such as monetization, retention or progression balance. However, I would like to focus on a less visible aspect of the game but the one that serves as foundation for all the rest: the Combat System.
Heroes Charge is designed around a very deep combat system that is taught to players bit by bit along the whole progression of the game. After months playing the game, players can still learn details of the combat system that can make a difference in a battle.