I really enjoy the inclusion of viderics into beings that might have been viewed as Gods by certain people, I think that adds a really cool depth to it.
The anomaly itself for me feels very short. There's a lot of things that you can delve into here and it feels like there should be a lot more, especially for the justification of them letting him go free (give us some of those lost souls!). I also want to know how the heck they captured him in the first place, it's quite the feat. What you have is well written but there's a more that could be done here.