Physics Mage, Fight Me If You Dare

So what if a mage can’t learn attack magic? Don’t they know the best offense is a good defense? Stack the thickest armor, take the nastiest hits. What? A mage duel? Hold on a sec. Fire immunity, petrified skin, shadow entanglement, stone battle armor, thorn aura, shield of light, vortex barrier... Come on! Hit me right in the face!