libram of voracity

You need to get 4 Crystal force (from pylons in ungoro by collecting the correct crystals from around the area), 4 whipper tuber root (DM east drops off plants), 1 black diamond.

Take those items and the libram to "Mathredis Firestar" NPC at the Flame Crest cave of Burning Steppes. Its cave on the North side. It will also cost you 30g, and he will then give you the arcanum that you can use on your leg and head slot gear.

Hope that helps "


Thanks, and to elaborate:
The crystal force are from a quest in Un'Goro, first you must do the prerequisites (discover all 3 pylons from J.D. Collie) and then bring 10 Blue Power Crystal and 10 Green Power Crystal to the eastern pylon, you will get 6 Crystal Force; you can throw away 2.
The tubers are from a 'quest'; the full details on this lucrative business in Felwood can be found here: http://www.thottbot.com/index.cgi?ccb=1&v=685997

Enjoy your +8 stat!~

edit: a discrepancy from the last post stated tubers were from DM east; there are tubers there but FOOD tubers (Runn Tum Tuber), not Whipper Roots.
As well, the one black diamond can be easily found off the AH or in BRD, fairly uncommon drops but they drop nonetheless. You can expect 2~3 per run.
And finally, the NPC in question to hand it in (Mathendris Firestar) can be found on this map: http://www.thottbot.com/index.cgi?m=6394