CALAMARAIN

The Calamarain are spaceborn intelligent, non-corporeal lifeforms that exist as swirls of ionized gas that emits Berthold rays (a form of deadly radiation that causes living animal tissue to disintegrate) when probing something but can also communicate through a sequence of tachyon emissions. They have the ability ot travel faster-than-light.

Source: Star Trek Universe (TNG: "Deja Q")