How do you go about creating a fictional language? One of my secondary protag's is from a fictional tribe in post apocalyptic America, and over the centuries they gradually made their own language and speak no English at all by the time my story takes place. However, my character, Kamenna, was exiled and now speaks heavily accented English. But when she gets really frustrated with something, she will drop a word or phrase in her native tongue. The problem is, I don't even know where to begin with creating any of these phrases. I was thinking something based on Gaulish maybe, or possibly a combination of Native American languages since the name Kamenna is from the Sioux I believe.