So here is the situation. I have a psyker, who, early on, was afflicted with demonic possession after a particularly bad roll on the Phenomenon Table. I don't want to abruptly destroy the character (the rest of the team are fairly hard-line); and just causing a demonic possession to manifest will get the character a hot lead lobotomy. No fun. So far all I've done is add an addition die to the psyker rolls to manifest powers. It doesn't add the total, all it does is check for an additional "9". I've even stepped it up to compare the die total with all the other dice. If it and any other given die totals "9" then that counts as a roll on the Phenom Table.
I'm going to start making demands of my "host". Depending on his compliance, I might step back down to the "one die rolling 9" idea. If he resists, I'm considering using that die as a subtractor to the overall total. If it causes the power to fail "Oh well, too bad for you, you should've done that which I asked...". The other idea I had was that, in the event of a rogue psyker being killed in his presence, he takes one unresistable wound, the possessor demon absorbs the rogue psyker's soul (and adds another die to the "annoyance pool") and all Acolytes in the psykers presence must make a perception test (at half value) to hear the soul screaming in agony as the demon laughs. Visually, the rest of the team will see lightning arc from the dying rogue psyker and the Acolyte psyker.
Anyone have any additional ideas to add? I don't want the player to think that demonic possession is a good thing. Overall I want it to harm more than help, but I don't want this to go 'whole hog' and have the party kill him.
NOTE: Eventually the demon will abandon the psyker and take up residence in a new host, but that will have to be developed as the story progresses.
