Eris

Eris was a Vorta in service to the Dominion.

Eris was one of the few Vorta to possess psionic powers. She was trained to be a field agent and had extensive training, including combat training with the use of energy pistols and the rhutala fighting style. 

In 2370, Eris attempted to infiltrate Deep Space 9 by pretending to be fleeing from the Jem'Hadar. She claimed to be from the planet Kurill Prime, which had recently been conquered by the Dominion. Her ruse was discovered after she had escaped with Benjamin Sisko, Quark and the crew of Deep Space 9 back to the Alpha Quadrant. When they attempted to apprehend her she was transported away.