[quote=@poog the pig]
You could make festering cracks in the earth that these vile spirits and demons crawl out of, kind of feeding off of Takkal's (or is is Toun? I keep getting the gods mixed up ;-;) nightmarish vision. 
[/quote]
That's a cool idea. I'll go with wells. Holes in the earth that gouge deep into the realm of the occult. Prepare for burrowing centipede-snakes.