The Lost and Mostly Forgotten Civilization of Plachulderia is so lost that and so mostly forgotten that no one remembers where it was or even what it was called. The name "Plachulderia" is a placeholder for now.
Despite all these unknowns, religious artifacts from Plachulderia occasionally appear in various parts of the globe, seemingly at random. They are technically not OOPArts (Out-of-Place Artifacts) simply because no one knows what would be in-place for them. I have taken it upon myself to recreate these things and keep some small fraction of a memory of these forgotten people alive.