One of the more interesting features of
Divinity II is that the game doesn't have your standard RPG skill tree. Instead it has three main combat areas (magic, ranged, melee) and you pick and choose your way through them. The system is a bit like the class specific trees in
Borderlands as you have unlock certain skills by putting points into lower level base skills. This video provides a brief overview of the system and ends with the coolest skill of all, turning yourself in a dragon.