So here's the idea: So imagine a forest, used previously as ritual site or something else a long long time ago. The peculiar effects of the forest are that it summons a persons fears if they are within it after midnight. Are you afraid of spiders? Well here's a giant arachnid the size of a dog hunting you. The idea is to have the foundation build a wall and guard perimeter around it with search lights at first. Then they run some experiments. Try to see where they come from, if some pattern can be devised, etc.
The first twist: The foundation realizes that some of the horrors that appear are, in fact, anomalous. This severely complicates the testing process, as any test can potentially spawn any sort of unknown anomalous entity that may cause problems.
The next twist: Killing the manifestation rids the test subject of the said fear or issue. This turns the whole dark ritual site on it's head, where it is, in fact, a proving ground. Those who traverse it and overcome their fears return as true warriors of old, or something along those lines. Idea is to have one D-Class do this, just barely, but once they do this, they realize everything they have done, everything they could do, and have them escape, for now.
I was wondering what you thought about this idea? Would you be interested in reading this sort of scp? And if you think anything might improve upon it, be sure to mention that.