Angry Birds Epic - Turn Based RPG
You have your usual level up stats, weapon & armour upgrades, crafting & various characters.
So far I have not come across any paywall, there are in-app purchases for the materials & gold you need but you can get these from just playing the game.
I've not played an iOS game for a long while (apart from Carcassonne & Lost Cities) but have been playing ten odd minutes per day on this for the past week.
Link it up to facebook to get your friends to help you on your adventure & complete the daily challenge for rewards. There is also a large world map to explore with various boss fights & wave battles.
Rovio are ticking off all the franchise boxes, whats next FPS? Call of Angry Birds