Stream Wraith

Stream Wraith
A phenomenon where hyper-optic craft traveling within galactic streams encounter electrical malfunctions and disturbing physical sensations during hyper-optic travel.

Attributed by some to invisible and intangible creatures that travel along the galactic streams - the equivalent of old salts tales of sea-monsters - others claim stream wraiths are a ploy of galactic cruise liners to spice up boring interstellar legs of their journeys by turning the lights off and on, playing sub-sonic frequencies over the announcement system, and fiddling with the climate controls to send chills down people's spines.

Travellers love to talk about having encountered a stream-wraith on a journey, adding to the suspicions of some that they are just a marketing ploy.