The tongue sting is a natural defense in Luxans. Luxans possess very long, stretchy tongues which can extend severa feet. Their tongues also contain an adaptive poison that can, on contact, release just enough to render the target unconscious. Luxans are able to launch their tongues out of their mouths to stun their foes. It should be noted that this attack, known as the "Luxan apical attack" by Peacekeepers, does leave a mark.
Luxan tongues are prehensile and can -- with practice -- by used to grab objects as well.