1, rely on yourself, only yourself and stick with your team
2, bring self heals
3, mending owns in RANDOM ARENA, do not come near tombs with it!
4, fragility spike owns
5, echo ---- that does 100 or so damage owns
6, people dont move out of meteor showers very often, make them pay for it!
7, bring anti-warrior spells that cause you to evaid/block or make him miss.
8, bring good damage
do about 4/8 of these and you will win. the other 4 people on your team you can think of as decoys, and you attack them while not being attacked yourself

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yet about <20 chars, their armor is greatly decreased by fighting foes of higher level [as in for pvp], meaning they take more damage, have less life, deal less damage and usually if they bring that char into pvp, they probably arent very good in the first place.