That's so funny to hear! It's truly a great word. Although ultimately, I'm going to say that you probably chose right with Benighted. I think it is a bit more personable, and doesn't read like a typo lol. "Chthonic" almost looks like a mistake when typed! Most people wouldn't even recognize it enough to see pretension in it lol. It's a truly weird word. Nice to talk to someone else who knows it!