It is just a different version of the word "parapsychology"
From the Dictionary:
of or relating to a genre of usually low-budget movies that includes horror, fantasy, science-fiction, and underground films.
From psyche + electronics, coined during the Iron Curtain decades after French term psychotronique attributed to engineer ...
The concept of <group/person/thing> that <protects/collects/defends/exploits> one or more <artifacts/books/spells> is fairly old. Heck, you could view the fellowship of the ring as a variant of this.
The Indiana Jones scene of the large warehouse full of forgotten secrets is probably the proximate inspiration for specifically warehouse 13 ...