I was going around in un'goro crater with my lv 49 mage... full frost spec.. then,
i saw those tar creepers, and my mate said, haha! i bet you cant take that lv 55 down! i took up the challenge.. my gear isnt the best... i used [Rune of Perfection] level 20, and level 40... then they dont resist that much ..
Then i tried fireball for fun... 1300 BANG smack... w0000000t!? i did fireblast.. 980.. kapow.. i saw they get vulnerability damage agaist fire... it gives +firedamage.. so your fire spells should do massive damage agaist those... and then i changed talents to fire.. and i tell you, with +50% crit agaist frozen targets, and ignite, i do IMBA damage agaist those mobs... pyro crits easely 1200-1700.... and then remember dot that gives 188 dam, and ignite that deal out 40% of the crit's damage out over 4 seconds...
Those Tar thingys drop alot of diffrent herbs and pots, that i earn HUGE cash on and if you're alliance, and use [Evergreen Puch] (darnassus rep thingy) then you earn un'goro soil from those mobs too, and get MORE money from those, and hand in morrowgrain for lots-a-pots