Hey! I’ve worked on this render gradually over the course of October. It’s primarily made from Megascans and also includes some piles of leaves that I scanned (4th image). I’m actually quite happy with how the scattering turned out because I tried a new method using a “ground proxy mesh” which is basically a smoothed heightmap of all the ground assets. It’s kind of complicated but it turned out well!
I’m happy to answer questions you guys have about any of the techniques involved.
Happy Halloween! 
Render time 3 minutes @ 4K with RTX 3060 & 32gb