The crystalbound shark has been bent to the will of an

artificer or other magic wielder, often an evil one, by the use

of the control crystal in its head, which also allows it to control

other sharks and fire a radiant 'laser' at enemies. They are

often found in pools hidden beneath pit traps in secret lairs in

extinct volcanos, sometimes in large numbers, almost always

with other sharks.

sheet here https://www.patreon.com/posts/86351218