Language is an essential part of any culture. Culture wouldn’t exist without some form of communication, and humans communicate by speaking. But the connection is deeper even than that. The language helps to define the culture which uses it, and is in turn affected by that culture. This dynamic process is what keeps a language “alive”: Latin is a dead language because the culture to which it belonged no longer exists.
This thread is for the development of rangerspeak, the dialect of the mountain rangers who guard the passes, known as munnum to those who hear it, for its resemblance to a mumbling noise…
If you want to add a "supernatural" touch to your campaign, define the rules of magic and the universe. Make your players comfortable with those rules. Then your new supernatural creatures must then break those rules.