So here's what I've worked out so far.
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-Lead the roach queen to 1
-Lead the wraithwing to 2
-Get stuck because I can't see a way of getting the eye past 3 that doesn't involve something else getting trapped there, even if I have the goblin in the maze. And the goblin won't move off it even once the doors are open.
I guess I could chase the queen to 3, but there's no way to get the wraithwing to stay at 1 due to the pit and the relative distance, and I don't see how a roach or goblin could be killed if I led it there. If they somehow could, I could just kill the eye.
What am I missing here?