Tarquin was a humanoid alien with telepathic abilities and some undefined power or technology allowing him to shut down the power supplies of starships. He was encountered by Enterprise NX-01 in October of 2153.
Born sometime prior to the 1750s, Tarquin was discovered to have telepathic abilities. As such abilities were considered threatening on his homeworld, he was exiled to his own planet to live out the rest of his days in isolation.
Tarquin's telepathic ability had a number of different aspects. According to him, every artifact has, imprinted on it, traces of the people who made and used it. Tarquin could read those imprints. He could also connect with certain minds on a very deep level, being able to read their every thought. Very few people have minds this sensitive; those who did included Morianna Taal and Hoshi Sato. His telepathy was limited in range; as a going-away present, his family presented him with an egg-shaped object he could use to extend it.
Tarquin gave Sato the coordinates of a colony where part of the Xindi weapon was being constructed. (ENT: "Exile")
