Gregorius21778: Through the Blood-Marked Door
This is a Halloween Horror: it will pop up when Halloween comes close¸ and I hope you find a way to make use of it.
Through the Blood-Marked Door leads to a place that is not there¸ yet may be entered and passed through. A place that has been formed by mankind murdering and slaughtering another. It may either be called forth by a Magus¸ Priest or Blackguard with a matching spell or called upon by Diabolist via a pact (see the last two pages).
The room has another door that leads out of it¸ which may open into any other room were a life was taken or lots of human blood was spilled within the last hour. Distance does not matter¸ all that matters is death and blood. Anybody may pass through the door while the duration lasts. Those who wish to get to the room that physically is behind the door must close it¸ and open it again with the intent to find the real room behind it then and pass a Saving Throw. Once the door is closed once more¸ it will open up into that demonic room (until the duration ends¸ see the last two pages).
But every time the Blood-Marked Door is used¸ there is a chance that it will take more than just stepping through it. Especially if those that use it do not spill enough blood for its taste.