Demogorgon perk theory: Bloodhound 2?
I never watched the show, but upon reading the Wiki one thing that stuck out to me was the fact that the Demogorgon is able to sense blood even from another dimension. Got me thinking that perhaps one of it's perks will have something to do with blood, similar to Bloodhound. Maybe it will let you see blood through walls or maybe the perk has some other effect that grows in power as survivors bleed.
It could also mean that the Demogorgon's power is based on blood, however being an extradimensional being I imagine it's power would be something like Freddy's or Spirit's where it enters this "upside down" world and hunts survivors from there.