Thanks a lot for your feedback, I’m glad you liked it!
Regarding the what’s going on part, I tried to summarize it in the intro but I realize it is not clear enough. I also scattered some of the details in the text itself (such as the corrupted priest having summoned the mantis) when they should have been presented upfront.
My idea was also to leave some leeway to DMs for improvisation (I initially thought about writing “Be creative here” in the Deep Forest location description but it felt too cheap lol), so you could easily integrate it in a wider campaign frame.
I’ll keep this feedback for next modules (or the expanded edition!)