User blog comment:Guildmaster Grovyle/JLE Role Play, Summer 2015/@comment-27103443-20150725053118

Achlys: "Probably because the changeling detector uses a pure Uranium-236 core infused with a tracking spell. If the a pony besides a powerful dark mage uses it, it will explode violently."

She says this casually, as if it's common knowledge.