Not sure if this has been posted before, I've searched and couldn't find it so I thought I'd post.
Pyromancer Loregrain-Blackrock Depths
14.2% Chance to drop http://www.thottbot.com/i11207 (Fiery Weapon Formula)
This dungeon boss also drops blue items with this Formula-Therefore getting a blue item as well as the formula on some runs. Which can be disenchanted into Small Brilliant Shards selling anywhere from 4-6g on Auction House.
The Fiery Weapon Formula is very simple to get with anyone level 60+, it sells for average 25-60g on my server depending on the stock in Auction House.
Hope this helped anyone getting sick of farming Motes on the Elemental Plateau. :wave: