I've slowly been painting CoS minis for my group. If you're in to painting minis this is a starter list that I used:
I went with these 3d printed minis from Etsy for my night hag coven.
I went with these Nolzur's werewolves from Amazon. You'll need a few of these.
I went with these Nolzur's blights from Amazon. You'll need a ton of these.
I went with these Nolzur's death knight & helmed horror for my revenants.
That's as far as I've gotten as I already had a pretty good supply of wolves, direwolves, skeletons, zombies, ghouls and ghasts. It's kind of a never ending rabbit hole once you start.
Wizkids has a helmed horror mini available. I painted it not too long ago. If you want, you could modify it by getting some green stuff putty and sculpt a dome shaped head. Here are links to the mini and the putty. Hope this helps.
https://www.amazon.com/dp/B001AE5ZQO/ref=cm_sw_r_cp_apa_glc_fabc_JN6XHY5HGA4W2391TWK5