Leech

The Leech (Cthulus Sanguinus) is one of the three playable aliens in Enemy On Board.

About
No mariner likes the night watch. While most of the crew is safe and warm below deck, the luckless have to sit in the murky cold, scanning the darkness for danger. Occasionally, the crew will awake to an empty watch deck, which ancient sea goers would ascribe to evil sirens, but were later understood as simply accidents. However, modern scientists now know they were both wrong. For they discovered, ''Cthulus Sanguinus. ''

Despite their immense weight, the Cthulus Sanguinus is deceptively fast, allowing it to punch holes straight through hull plating, to leech off the life force of the unsuspecting humanoids within. One survivor, found near death in a wreckage, claimed he never even felt himself being drained, up until he started hearing the screams of his nearby shipmates.