Sshirshiss (Lizardfolk Language)

Sshirshiss is language comprised of predominantly of hissing and clicking, and originated as a military tongue during the Dragonborn Invasion . The speakers of this language pushed into Elvish territory, wiped out the largest Elven fortification and remodeled all the rest. Strange magic from that swamp (or perhaps from the Elves) slowly changed the Dragonborn that inhabited that region, completely overwriting the way they spoke, thought, and operated. Sshirshiss has no written form, and can only be spoken by Dragonborn and Lizardfolk due to the primal sounds it requires.