Energy-Based Life-Form
History:
A graviton field generated by a previously undiscovered life-form threatened station Deep Space 9 in
2369, when an archaeologival artifact, discovered by Vash in the Gamma Quadrant and stored on the station, was found to contain the
entity. After the object was beamed into space, the winged energy crature emerged from the artifact and flew into the wormhole,
leaving Deep Space 9 to return to normal.
DS9 "Q-Less" ; Star Trek Encyclopedia II
.