If you want to go tanky, you need tons of Health, Crit resistance (through Impenetrable traits), big magicka pool and magicka regen as high as you can get.
Light Armour is (unfortunately) the only way to go so get a Sword&Shield (% Block reduction passive) and a Resto staff (magicka management) weapon swap combo. Blazing Shield + Harness Magicka are your best friends.