Hmmmmmm...... I can offer Demon up as a 'Nightmare'. He is currently stalking and watching people for weakness in an effort to either
a) Try and recuit them for his army to get his mate back
b) Attempt to use his Kalona black magic on them in an effort to perfect his techinque and grow stronger.
Black magic basically attacks the body like a disease, and can take any where between minutes (if they are already fighting an illness) to hours (if they are healthy and strong). It will wear off when the kalona gets too far away OR when they are healed by a pure unicorn.If you don't need anyone else for your nightmare plot thats fine XD
I would be happy to have Demon come out to play either way.