This has made it a hassle to find him for many players, but it's actually very easy once you know his location. To get to Kovork, go to the Circle of Elements and face towards the west. This will let you see the cave entrance. If you don't see it, check out the screenshot below.
|This is the cave entrance for finding Kovork.|
Kovork has a 100 % chance to drop the vanity toy Kovork Kostume upon death, which will transform your character to look like Kovork himself for 10 minutes.