I really loved this take on havoc, and the story has really good bones. My one critique is that the POV is a little inconsistent. In some parts you are writing in past tense, in others you are writing in present tense. Likewise the perspective is a tad confusing, it mostly reads from the perspective of the cultists but there are some sentences where the narrator does not know what they're thinking and other times where the narrator does.
I thoroughly enjoyed the story though, and with a little more polish this could be truly great!