Turn based and action are mutually exclusive. It is not and does not resemble an action game.
The assets are 3D. You do not play in 3D. You do not cast a spell and have the physics of your interaction calculated in real time while 10 other characters are simultaneously acting and having their spells calculated based on the real time movements of all the other characters. You do not hit a jump button and have where you land determined by your speed and direction. The actual gameplay mechanics are all pure dice roll. There are no 3D physics in play.