As you know, during the quest On Ruby Wings (On Ruby Wings - Quest - World of Warcraft) you're given the item Ruby Beacon of the Dragon Queen, allowing you to summon a Wyrmrest Vanquisher every 30 seconds to ride on as a siege vehicle.
There are pre-quests to this... Except my memory's been a little blanked from Christmas, bloody fatigue...
Why bother killing 30 ghouls and handing it in when you can take a detour and kill the Rotting Storm Giants for 2k experience normal at level 72?
Well, I found that using Engulfing Fireball (12000 damage) will stop him from granting EXP, but be sure to land right next to him (800 damage melee hit from him) and use Flame Fury. It takes at most 3 channels to kill the mob, 15k mana, which of course you have Devour Ghoul for replenishing.
Of course, there's only about 12 of these rotting spawned at a time, and they take a while to respawn, so you'll have to entertain yourself during the 3 to 5 minute respawn (You own books and handheld consoles/mobile phones, surely?) but these things are alot quicker to kill than completling a quest, so 24k exp (48k rested) every 5 minutes is better than questing.
Oh, I forgot to mention these guys tend to drop 60+ silver, it's not much, but that extra... 7 gold 20.. Wow.. Every 5 minutes could get you... Some new arrows maybe, a few repairs? Use your imagination :P
Apologies if this is a repost, I searched "Wyrmrest Vanquisher" "On Ruby Wings" "Rotting Storm Giants" and found nothing. Flame on if it is. Don't bother wasting one of your limited +reps on me unless you feel it necessary, I don't collect.
So uhh... Enjoy the exploit. I doubt Blizzard intended on this at all.
Useful Links:
On Ruby Wings (Quest): On Ruby Wings - Quest - World of Warcraft
Ruby Beacon of the Dragon Queen (Usable item): Ruby Beacon of the Dragon Queen - Item - World of Warcraft
Wyrmrest Vanquisher (Siege vehicle): Wyrmrest Vanquisher - NPC - World of Warcraft
Flame Fury (Spell you HAVE to use on the mob): Flame Fury - Spell - World of Warcraft
Rotting Storm Giant (Mob you kill): Rotting Storm Giant - NPC - World of Warcraft