A fairly simple idea: You are able to make a "Skull Jack o'lantern", by using a skull and piece of driftwood.
Or, instead, a skull and some timber. Any combination of skulls and fire/driftwood, whatever makes the most sense and is easier to code.
I'm not sure if this should be a native ability, or just an ability for everyone.
In my opinion, it should be a year round ability, as opposed to just being on halloween, since we can carve pumpkins year-round.
I'm also not sure if you should be able to excorsize spirits with them.
Or if they can be placed down so they can be part of the "backround" of the square you're on. (Exactly how rocks and other items can be placed down in Nexus Clash). By doing this, this could be used to ward off spirits, or block you from one of their wails. Of course, the spirits could possess you to attack the Skull Jack o'lantern and break it.
Please discuss this piecemeal suggestion