Took my 14 necro out to the gypsy camp in So Ro to turn in some greater light stones and happen to kill a mad man by the camp that dropped the truthbringer gem.
Ok, first off there is a lvl limit on this. Not sure what it is yet though. 2nd, ya need 3 gems called truthbringer gems. These drop off undead(usually Drybone Skeletons, Higher Mummies, and Ghouls) in Oasis of Marr. Then you have to kill an Erudite Necro in South Ro for the ring itself. He spawns near the undead tower and wizard portal. I found him just in the sand right of tower and north of portal before the first dune.
After you collect your gemss and ring hit the Temple of life and there's a new froglock NPC on the bottom floor. If he says to go hunt gnolls your too low to do the quest. Then once you have this ring go back to Oasis and get your emerald for your 2nd ring. Good Luck