Larian Studios Forums Divinity: Original Sin 2 Divinity - Original Sin 2 - General Weapon Differentiation - attack patterns/bonuses

The game defines magic damage as the elemental: Fire, Earth, Water, air, and I believe Poison (poison is the odd one in this. Then again "Earth damage" is odd as its own damage type anyhow).

Physical damage is Raw and I believe Bleeding damage (but that might be an assumption. Bleeding that is).

So basically anything of the Five Elements (Fire, Earth, Water, Air, Poison) is magic. Everything else is physical.