Larian Studios Forums Divinity: Original Sin 2 Divinity - Original Sin 2 - Help/Tips/Tricks Help on building hybrid fighter/mage.

The only way I see you pulling this off is by going with Geomancer as your Mage half, because it will increase you Physical Armour passively. Weapon attacks from Warfare will scale off Intelligence if you use a Staff or Wand, so you would be free to pump Int WAY high, and you could pump Geo up and still maintain a decent amount of Physical Armour.

Cas

P.S. There are also a few Geo Skills that give Physical Armour too you.