So the next plot point in a long running quest will have a newly-gauntleted "healer" mage (Sebastian) recover a minor artifact from a demon.
This came about rather spontaneously in the last session, and thus I'm not quite prepared for it.
The demon stole the artifact in question from a mage 100 years ago, and has been hiding it ever since. It's in the Roman tribunal, so I'm thinking that the demon will be an Aerial demon that causes the infamous "roman fevers". I'd like the demon to have had a part in the fever that took the life of Otto III in 1002. I'm thinking the demon has his lair in an infernal swamp north of Rome.
I'm thinking that NPC mages that Sebastian is working for have been planning this raid for Holy Saturday, when the demon will not be able to assume his physical form. Due to the low-power of all the PC's involved, they will not be on the front lines of the battle. Rather, they will be in charge of getting into the lair, finding the artifact, and getting out. Afterwards, the Sebastian will need to patch up some of the battle damage.
I'd love to get some quick ideas for what this infernal swamp might be like, and what servants the demon might have. One obvious power of the demon would be causing fevers. For its minions, I might go with severly warped humans that have nasty frog tongues that can pull swords from opponents' hands (although this might be a little too high-fantasy for my tastes.)
Any thoughts on the physical lair of the demon would be welcome as well.
Thanks in advance,