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Player Race: No
Relation to UFP:
Unknown.  Likely hostile.

- These guys were sucking humans soul energy in the past.. no way you can be one of these guys.

Intelligent lifeforms native to planet Devidia II.  The Devidians existed in a slightly different time continuum from 'normal' matter, and thus were onlly barely detectable to an observer in 'normal' time.  The Devidians thrived on neural energy that they stole from dying lifeforms.  In 2368, the Devidians sent an expedition back in time to 19th-century Earth, where they attempted to extract large amounts of neural energy from victims of the cholera epidemic in the city of San Fransisco.  They were prevented from doing so by members of the Enterprise-D crew who also traveled back in time (Time's Arrow, parts 1 and 2 -TNG).
Star Trek: The Encyclopedia (1999 edition)