Speak in daemon-tongue

I understood this man perfectly, but would he understand me? The language of daemons is as old as existence and entirely incomprehensible to mortals, but he wanted me to speak, so that's what I did. I told him he was a foolish cretin and said that his mother was a goat, in daemon of course, which he simply frowned at. Good, good - the mortals were no closer to understanding daemon-tongue than the last time I was here. Now, to have some fun with this one. Daemon-tongue is incomprehensible to mortals, but very powerful. Indeed, it forms the basis for all mortal magic. If I wanted, I could speak words of power...