A gratified merchant (Feerrott)

Kill all mobs surrounding an Evol Ew Mark ( 28, -12, 403 ). After each clearing, you'll get either a chest that gives a nice buff, a group of ^^ or higher mobs, or a distressed merchant. The Mark will disappear and reappear a short time later. If the distressed merchant appears, clear the area again and he'll turn into a gratified merchant, who will sell you various items.

There may be other locations, too. Look for an Evol Ew Mark.

Related Quests
Feerrott Creature Cataloging