Update: last night it just finally appeared. I had gotten the token for summoning the anomaly a couple days before that, but it just wouldn’t work when i said “show me”. Then last night it just.. appeared. So, now, onward I suppose. Wonder how long it will take before it appears for the next one that needs it.

Me too. I went from early level 3 to now mid level 5 without the illusions anomaly in Jack’s Tower. It’s been other places, but not the Tower. My zombie hasn’t dropped the summoner yet either and i’ve fought him every chance. I’ve given up hope of finding it at this point and have come to terms of never completing this event.