I was kind-of hoping you'd say it like that. I had the idea of a very old Dark Continent nation that basically lives off of their land's rare material that they'd call a pathway stone. It'd basically be the stone of Aja from jojo's bizarre adventure but for sound and light, and what you said made me realize, they'd only need technologism to do what I had in-mind. They'd have a system for surgically implanting these stones into their royal families via Egotism while the main polymathy of their royals would be various ways to use the stone. With the stone working as a optomechanical crystal, they'd use technologism to adjust it for trapping sound and light together before also using technologism to release it as a dangerous lazer.

I cooked up the background for the country before fully understanding how the power system worked and wrote that the reserve of the material was their country's bread and butter. Would something like that be possible? 

Edit: To clarify, the egotism is basically a one-off thing for making them more resistant to the blatantly dangerous vibrations and heat and basically so that they don't die using their gemstones. 

The abilities that would stem from using technologism on the stone would be things like amplifying sounds with the trapped light, magnifying light like a powerful magnifying glass, shooting the equivalent of a flashbang, etc. They'd be weakest in dark areas, and strongest in water.