NEED TO FINISH & CLEAN UP!!
07/18/2023
Contrivance Sigils can hide all types of information, and only those linked to it can use it.
There are many ways to "link" to such sigils and this "encryption" is nearly unbreakable outside of a wish spell.
Practitioners of "hidden" and secret spells tend to hide their spells in such sigils and then grant authority to those able to use such seals.