I have a potential god boon or mana reward I'm interested in, but I'm not sure if it's thematic, where it would best be suited, or even if it's allowable. I'm thinking mana, as it doesn't really help be scary or stealthy.

I would like a power that allows a sort of Midas' touch, and turn things into precious metals/gems/etc, with the caveat that they only REMAIN changed while in his possession/lair/etc to fuel those gargoyle hoarding instincts. If they're given away, traded, stolen, melted down, repurposed etc they revert back to what they were before .. or are destroyed or otherwise nullified as a thing of value, so it can't be abused economically OOCly.