Ok. I have turned in at least 200 of these no kidding. As a 46 Iksar warrior there are not too many mobs that are blue that i can solo and Kerosh Blackhand in Field of Bone is one of them that I can. He is a rogue and so when I solo him he doesnt get to use his backstab. Kill him every time.
Now I say this, not to change the subject, but to say that BECAUSE I can kill Kerosh, I camp out the Maruader cave on the north shore of FOB zone. If you cannot handle a lvl 33 Iksar rogue then DO NOT GO IN THE CAVE. There are 9 Maruader spawns and 4 Manslayers spawns in the cave and the Kerosh spawn. I Clean out the cave continuously, and kill Kerosh for exp when he pops, and when my packs are full of loot and MM rings I head to town. Give the MM rings to my Necro alt. and sell the loot and head back to the shore.
My Iksar Necro skipped all of lvl 17, 18, 19, and half of 20 just by turning in the MM rings that my main collected. No kidding, about a full blue of exp for each set of 4 rings if I remember right. ALSO, the factions are nice but not essential, I say that because all iksars can go anywhere in town, the merchants faction is cool because we dont have any CHA to speak of (55).
LASTLY, when you turn in the MM rings only turn in one at a time. Just about EVERY time I go see Drill Master Dal (on the balcony walk above the water, near the entrance to the warrior guild area), I turn in 1 or 2 or 3 rings, and bang, the quest is complete. I mean, like 9 out of 10 times I go see him. This is because so many people mistake the other rings for MM rings and think they have 4 to turn in. Resulting in a half done quest that you can finish with 1 or 2 or 3 more rings. Just dont go to see him unless you do have 4 MM rings, because maybe the last iksar already did what you want to do hehe.