This world quest in the Isle of Dorn wants you to kill 15 kobolds.
There aren’t even 15 kobolds in the quest area, so you’re always waiting for respawns which take 5+ minutes.
Easiest way to fix this quest is to draw the quest area so that it includes the entire kobold area, including the level below the current quest area, as there’s probably a good dozen+ kobolds down there too.