Maximum mosasaurs are often mistaken for other creature beings like dragons or leviathans. With individuals measuring over two hundred feet long and possessing an abnormally crocodilian hide compared to the sleek scales of their diminutive relatives. These massive creatures roam ocean and seaways without a real known nature. It is unknown if they need to eat, as none have ever been seen growing hungry, and where they come from, some theorists believe they hail from the elemental plane of water but these theories have yet to be confirmed.
The most frightening abilities of these reptiles is their vast intellect. Capable of speech in various tongues their voices are nearly deafening as they surface from the water to commune with surface dwellers. The spouts of water rising when they exhale described as geysers. Paulus the elder was able to account for one legendary encounter with one known believed to have been the legendary "Immenseness"
Our ship was traveling through the Terwick sea, as we traveled a conch shell was blown and we watched a warband of Sahuagin swimming straight towards us with white sharks and tridents ready. We braced for impact but from their left flank we watched them all die in one moment, a vast set of jaws crushed the fleet like a grape in the arms of a man. I watched the sailors panic, grabbing their harpoons and spears for preparation of an attack before it turned, I expecting it to let out a roar, or breathe pure steam but instead I heard a voice I will never forget. I know not truly what it said though, the beast spoke as though a thousand drums and horns blew at once, as if a symphony of trombones in such a number no mortal could count. It launched a torrent of saliva with every exhale before it turned back and vanished under the waves.