There are magic weapons and armor of varying strength, the magic increases their abilities to inflict damage or protect. Here are the weapon names, weakest first: Ruin, Might, Force, Power, Vanquishing. Here are the armor names, weakest first: Defense, Guarding, Hardening, Fortification, Invulnerability. There are other magical abilities which increase durability, accuracy or even give mage spell abilities. Also, silver weapons inflict double damage to undead.