The only reason the world hasn’t ended isn’t because the ceremony’s incantation is written in an “unspeakable language.”
It’s perfectly speakable.
It just sounds ridiculous.
Lots of “bluh” and “duh” and “phbhbh” sounds in it, and the repeated phrase “I’m a big dummy who wants to end the world”. If you robe-wearing weirdos could get over your egos, we could have this wrapped up pronto.