I cannot stress to how AMAZING the exp is on killing these with the limitations of physical speach...
SRSLY
Anyone looking to pound through level 37(35 with a PL)- level 42 amazingly quickly would do themselves a great favor and get WoTG expansion and go kill these at one of, i believe, three camps in this zone.
Theres one at J-9 i think, one camp to the south (on what looks like the 'tip of the finger' on the southern part of the map) and a third camp somewhere else. PLD tank is recomended, a healer, brd or cor and 3 DD's (piercing damage if you can get it) and just watch the little flying balls of exp die.
At lvl 38 we were totally fine and could handle everything with little resting. I've heard you can exp on these as early as 35 or 36 with a PL though.