Thri-kreen

Thri-kreen characters speak their own language, thri-kreen, which is composed of clicks, whistles, and snaps of their mandibles. This language is notoriously difficult for non-thri-kreen to pronounce, but relatively simple to learn. At the Dungeon Master's discretion, one or all of the other members of the party is able to understand thri-kreen as a bonus language. You can perform the verbal components of any spells you possess in thri-kreen.