Talk to Ahaadah on the upper level of Philsopher's Alley, in Aht Urhgan Whitegate, to start this quest. Next head to Port Al Zahbi (this is the south port in Whitegate) and walk under the awning with the barrels under it, to the left of the Qiqirn NPC for a CS. After that, go up to the upper level, still at port, and walk past Salaheem's Sentinels and all the way to the end of the dead end path, for another CS. After that CS, head up to the north port and zone out to the Thicket. Head along the path, eventually you will come to some grass you can walk though. There will be a ??? on the left side of the path here (I-8).
Make sure your party is ready. Have everyone who is on the quest examine the ??? for a short CS (if they don't get this CS, they will not get the reward) and then a Plague Chigoe NM will spawn. This thing seems to hit faster than Hundred Fists and for a decent amount each hit (it hit fast enough to actually interupt stun, that's how bad it was) and its attacks have both endrain and enaspir (ick ick ick). Thankfully, it does seem to have very low HP, and it's susceptable to sleep, so ust kick its ass and try to keep whoever has hate alive. Once it's dead examine the ??? again for another CS that ends the quest, and your reward.
Obtained: Map of Caedarva Mire
EDIT: changed name on Dezzimal's advice