Like all of us, get 80%+ ele resistance and I find that if you buff with a knight that is set up with max Elemental resist buff and the Elemental Damage absorb buff, it is soooooo much easier. No other buff toon really required. You will have enough Damage by yourself to anihalate the mobs fast.
Steer clear of those Mage mobs that debuff you, and the ones with 1000 DOT as well.
In Air world, the mobs will debuff your ele resistance so extra Ele resist buffs are nice to counter that.
Ignore Driesje89 - he is a smart ***
Get your own knight or level along with a Knight friend.
Ranger buffs are nice to for extra damages.
Get you HH armour as soon as you can.
The HH Helm will give 22% ele resist by itself. Norgen Necky also for 12% ele resist. Put Ele Cape in Norgen Neck/max your own Ele resist Passive/Couple of Ele Stones in Gloves or elsewhere and you are starting to look good.
Some mobs will raise your cast time, so get the best cast reduction you can.
HH Gloves are a source. So is L80 HH Weap. I kept one of my HH Weaps at L80 just for that reason.
Basic really.
PS: other sources of Ele resistance are Haul ring 10% and Biglos necky 10%.
Elite Helm can go up to 10% ele resist also.
). Sorc for heal mana xD. mage got own heal skill (not like ele but its ok.) and ofc the elite headband with ele resi (and cooldown if possible). at least a berz for better damage ^^^^^^^. knight is a + 
bro I lvl selfbuffed and I can tank mobs... I only run cuz I don't like to stand still ... I kill easy mobs with my lv101 summoner (lv100+ mobs); if I've party buffs how rangers one I think to destroy them lol
