Seech

Changling

Seech is almost solely spoken by Changelings. Not only does it use frequencies above many race's abilities to hear, it also must be spoken simultaneously with languages or sounds produced in the hearing spectrum of other races.

Due to this nature, a changeling can say the exact same phrases in normal hearing range, and produce entirely different meanings.

This language is almost considered a trait of changelings, more than a language. Since it still must be learned, and has a few different dialects, it is considered a language, and not an "ability" like telepathy.