As I understand it from the 'teaser', is a turn-based system supposed to be used? Maybe that's not the worst thing (as it was in Divinity: OS). However, many people who are fans of this kind of setting also like the real-time combat (like Baldur's Gate or Pillars of Eternity). Perhaps you should implement both of these systems at the start of the game concept and let the player make his own choices before the game starts? --- Do you want to use turn-based combat or 'classical' system?