Went to where it told me to go for the mobs and it's just not there. I also encountered another Cultist of the Aberrant outside of the map walls but I could at least kill that one. Hopefully I don't run into any more of these aha, but just thought I would share it so that it can be fixed.

https://i.gyazo.com/2af355a90b1ebbec9d197b498104fdb7.jpg