This is a free God-Machine roleplaying scenario written for Mummy: the Curse (1st edition, although it can be adapted to others). You will want to have the God-Machine Chronicle book for reference; the Mummy and Demon: the Descent core rulebooks can also be helpful. The scenario is not heavy with rules and powers and can easily be tailored to suit other supernatural character types.
Only a brief outline of the scenario's basics is presented here; the rest of the Storyteller secrets are in the full Google doc version linked above. Please do not read beyond this page if you are a player. Send this to your Storyteller and let them delight you with the surprise.
The characters are roused by their worried cult(s) with pressing news: Some of the potential relics they had been tracking through the area have been purposefully destroyed within the last week. The remains of the savaged items have been left behind for someone to find each time, and last night the cult stumbled across a compound full of broken bodies, as well as a message which seemed like it was calling for a mummy's attention – or its destruction.
The first piece the cultists lost was blamed on a careless new employee at an antique shop. The second item was found crushed in front of a local museum, and that incident made the news...
The outright destruction of the pieces has been troubling enough, but the murders upped the stakes and the message came across as a threat to any nearby mummies. They call upon their guardian to discover and destroy the menace to their list of valuable artifacts in and around the city. From estate sales, to antique shops, to museums and private collections, no one with truly ancient fare in their possession is safe.
While this scenario can be run in some smaller and more secretive locales, it works best in a large metropolitan area with multiple museums and a good deal of traffic from other places. A city which makes regular use of planes, trains, and ships will have the most options for dramatic locations. That doesn't mean that highly condensed cities won't work, however. A limited area like San Francisco could result in fewer obstructions and faster resolution, while the urban sprawl of Los Angeles almost guarantees unexpected obstacles and complications in transit.
One mummy and their cult can face this challenge, or multiple mummies and their cults can get involved (though in this case, the cults should have low to moderate reach and grasp and/or not be affiliated with one another, in order to explain why they didn't just coordinate the efforts amongst themselves). Multiple mummies with membership in different guilds will be able to track the widest range of relics, though they can always fall back on the cultists' list. Not only should the mummies be concerned for new pieces, but any relics and vestiges they already possess are likely in peril. There is also the possibility that a blasphemous mummy who is shirking his duty or one of the Deceived is behind this, something that will get most mummies' bandages in a twist.
Characters can also be drawn from other supernatural types, from a mixed group, or from mortal ranks, but those options will require further thought. Characters that are not as tied to magical objects will be less likely to care, mortals will have a harder time tracking them down, and those without a cult or group of investigators will need some other way to realize what is happening.
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Thank you, and happy gaming!