Very clean design. You went with mostly black and White, but the green is clearly setting the vibes for a thrilling pointcrawl in the woods. I like the hand-drawn map and the writing is very understandable. There is content for a couple of sessions and, with some work, even for a smaller campaign.
Just wanted to ask: I believ the guards tell the adventurers about the beast and keep the secret from the ordinary people, right? Or do their chief pay 1k pieces for killing a generic beast? Will they describe the features of the target? Or is the secret known and kept by the entire village, and they took as a mission to be the guardians of that knowledge?
Also , I imagine it's called the widow cause, being a mantis, it ate his husband after procreation, or is it for a different reason? In that case you might want to make the GM and players know there are rests of the precedent preys, or maybe she's even feeding their meat to the spawn. Just an idea!
I like both the adventure and the presentation, great job!