Shattered Kingdoms

I had this problem and found that the quest wants you to kill three certain NPCs and not the random respawn NPCs with the same name that wander the area.

I've had that problem before, but I was able to complete it. I thought at the time that it had something to do with a weak and counterintuitive quest completion keyword, but I don't remember the details that well. It could be that the quest is associated with too limited a number of Mobile #s.

Nope. Three types of NPCs, no others that I can find that match. There are no special 'certain' NPCs; any random one one of the three names will do.

Anyone having trouble performing this quest can send me a PM with their character's name and I'll check your quest progress; that might help find the cause.

Well....I dont want to say the solution here, but the three NPCs in question sit in a room and dont even move. Once I killed them, I them auto completed the quest and was never able to complete it just killing the other NPCs that moved around the quarry.

Ditto. It'd be less mind-numbing if more than just 3 specific NPCs worked for the quest.