From EOGamer Star Trek Online Wiki
The Lethean are humanoid, telepathic species. There telepathic abilities to attack quite fatally, led to them being hired by criminal organizations within the 24th Century.
Lethean required traits:
Maintain; Targets Foe; 15.24 meter Range; .5 sec activate; .5 sec; (2 max); 2 min 30 sec recharge; *24 Psionic Damage; *Hold
Innate; +20 StealthSight; +1.5% Expose Chance; +1 sec Expose Duration;