In PVP 55+, Mages get a great advantage If you are vs a Hammer guy/girl.
Fear, Decrease speed, Aoe, attack and run.
I usually killed most of hammer people with this, If not you just took alot of seconds with his hammer, If you has an ice cube, use it and his hammer would be probably gone by then, If he a fighter you will be probably dead If he tries to stun you, archer, well depends how good you are Vs them, cleric, depends on how much STR they got, another mage, I dont think he will stay there to kill you.
But of course there is another thing here, Since he/she got feared, most of the people will want to take his/her hammer off, if this happends, your now safe, since the new person who got the hammer, will look for the closest person and kill him/her, since you are mage, you will be far away and he/she wont look for you.
With archers, you will usually kite if he is searching for you, with this you can take a large amount of HP off of him/her, specially if he/her is a mage, If it is a fighter you can hardly kill him, but is possible, if it is a cleric, since he is not able to use heals and shield, you has a higher % of killing him.
Sadly you cant Stun or Fear, so you will need to wait until someone gets close to the hammer dude/girl and stuns/kill/fear him.
With clerics, well, your dead, you do not has a long range attack, your invincible skill will not work, you only has your luck and an ice cube if possible with you.
With fighters, you are dead too, you still has your deva, but is a close range skill and you will die while you try to make it.