N'ghoh-Ewuuu

A spell that must be spoken with utmost care. The entire existence of a being, object, or place will be negated if the phrase N'ghoh-Ewuuu is spoken. It was created by Nouon as a way for his cultists to easily destroy his enemies. However, the phrase is unpronounceable by a human, and impossible to spell with mere letters. Humans, being clever creatures, watered it down to make it more comprehensible. The popular 'No u' comeback destroys a universe each time it is spoken. In effect, the end times have already started, and Nouon is getting what he wants.

The being
It is unknown what the being by the same name is, but it has the power to destroy anything.