Squid

Squids were a type of multilegged underwater Rahi and a fully organic sea life. They could suck life energy from targets, so the Barraki used them as weapons.

The squids were specifically bred by Kalmah, and he is also the one who built the Barraki's launchers to help the squids travel quickly to their target. He would not let anyone into the breeding grounds, ever since Mantax ate half the brood. Kalmah kept them half-starved so that they would be ready to fight, and would be hungry for the next foe to suck the life from.

Trivia
according to the Barraki short film they could be caught and fired back at a target