This might have already been done before but as far as I could tell, it hasn't. Admittedly I got inspired for this idea after reading a Tomb Raider/Indiana Jones fanfiction.
It consists of two or possibly three SCPs. All of which must be contained in their original location.
The first one is an artifact (which in the fanfiction is an amulet but I will use something else instead) which is placed inside an ancient temple upon a stone alter. It must be kept inside the temple in order to contain the second one. This one can be classified as Safe.
The second one is a much more dangerous series of supernatural entities which could cause a world ending event if released. I am not sure what to classify this one as but I am inclined to go with Euclid since it does not exactly meet the criteria for Keter but is also not exactly tangible enough to be Safe.
The possible third one is a series of supernatural entities that assist in the containment of both the first and second ones. They are essentially the spirits of the priests who kept the temple protected in ancient times and can communicate with outsiders by some telepathic method. This one is definitely Euclid.
The temple is essentially one large containment site built by an ancient civilization to contain a series of evil entities from causing a world ending event. The artifact and its chamber is part of the special containment procedures. The temple is filled with traps and to prevent the artifact from being removed from containment. The village and its inhabitants nearby are all that remains of this ancient civilization and they keep watch on the temple. The Foundation will assist in keeping this site secure from intruders looking for treasures.
TL;DR Ancient civilization builds trap filled temple to act as a containment site under the orders of their deities to protect an artifact which is used to contain some evil entities. The Foundation assists the surviving members of the civilization in securing the site.
Can these SCPs be combined into one article or should they each be placed in a separate article due to their difference in classification?
Here is the link to the source of the inspiration for reference: https://archiveofourown.org/works/14749166/chapters/34292588#workskin