Okay, this may be obvious to some, but I didn't know about it until I discovered it tonight, figured I'd toss it out there. I've been farming my Primal Mana north of Area 52 for the past few months, thinking to myself "What a sucky drop rate, there's gotta be something better".
Turns out, there is!
Jump on your trusty flapper (or whatever you might have) and head out to Netherwing Ledge. The Netherwing Rays that populate the floating island have an amazingly high drop rate on Motes of Mana. I killed about a dozen and managed to get 17 motes. Hopefully you'll get an even better drop rate
Oh, and watch out for the 72 elites that patrol around. They're never really pleased to see you.
P.S. - You can also get a lock friend to summon you out there. Don't ask random ones though, they usually hate to hear "Hay, kan u sumon me 2 netherwing ledg pl0x?" and will promptly ignore you =P
Happy farming! :wave: