Dark Memento encourages fetishism. It asks that we obsess over every detail of an object in search of intimate meaning — as would an amulet or myth. Materially and symbolically, the collection portents the passage of time and an unknown spiritual future. Precious metals presume longevity, while dilapidation points to impermanence.
The hope is for the ward to consider a piece, put it to use, and then return it all to its "sacred place" to promote ritual.