Water-based reptilian predator. Well armored and deadly at any range.
The amphibious Grenchler lurks in marsh areas in search of prey. Fearless, it will spring from hiding and attack anything that moves. If it is unable to fell its prey with its powerful jaws, it will fire a potent burst of energy at them. Grenchlers have one weak spot—a genetic defect makes the shell on their back susceptible to explosive blasts."
Reference image. Made for biog's Xenozoology contest, for which I thought an alien creature from Metroid Prime 2 would fit nicely!
For best effect, listen to this while viewing.