pvm = player vs monster. It just means you use the character for normal play and not dueling other players.
You really need a second damage type like fire. How many skill points have you spent so far? If you have only spent 50ish then you could start putting points in to either meteor, fireball, lightning or chain lightning. Most people don't put many points in to armour spells because the points are too valuable in other places to improve damage.