Meta-viprium gas

Meta-viprium gas is an extremely toxic gas found inside Puffers and possesses some caustic properties; it can quickly kill an organism if inhaled and can tear through even the strongest of metals. It is used mainly as a defense mechanism for the Puffers, discouraging predators from trying to eat them, but it may also be used as a hunting tool and a propulsion system. The gas can be slowly leaked for the uses mentioned above, but it will be violently released if the Puffer dies.