2012-07-05, 02:51 AM
Well, I can't really answer your question for how often Primal Essences drop, but I've found that the Sky Terrace maps in Ludibrium are a great place to farm just about all of the different veins, as well as heart stones. Just run from one end to the other, CC, and repeat. You could also try the Robo maps just under the Sky Terrace, as those ones loop around, allowing you to go from one end to the other and then down a level, then travel back to the start and finally CCing to repeat.