Dragon turtle

Look at this thing. It has positive modifiers in each of the mental stats. Please, please, please, don't treat it as just an aquatic beast. It can be so, so much more.

Ships transporting magical components and alchemical goods between the coasts of Dardagos and Nuova Zbriglandia have been disappearing. An expedition under the lead of Captain Karamarkos will yield a disturbing truth - Zgrulla, an ancient dragon turtle, has began amassing wealth. Apparently, she dreams of flying across the skies like true dragons, and is paying an entire tribe of sea devil witchers an exorbitant sum of money to conduct a ritual that would give her wings. If the ritual is stopped, she flies into a murderous rage - but less vengefully minded sailors might aid the ritual, earning her gratitude, and the knowledge of the unexplored, riches and adventures filled Blodmoon archipelago.

Several years ago, lord Asmint got what he thought was a snapping turtle for his garden pond. When the reptile started becoming too large for the pool, he ordered his slaves to release it into the glades right outside the city. The slaves, in their laziness, actually released the turtle into a nearby sewer pit.
Several years have passed, and the "Sewer Dragon" has grown as large as a horse - though its size is somewhat stunted by the confines of the space it resides in. With an urge it doesn't understand - one for the open sea - making it nervous and agitated, the reptile now plots revenge against its former captor. Anyone wandering the sewers risks getting forcefully recruited into its war effort.

The treasure of the pirate Ysgarr contained, among other things, the Eye of Storms. The famed gem turned out to contain the wild magicks needed to undo a curse cast upon poor Ungar the Unlucky. Unfortunately, years back, before he became a professor at Port Lagrazza's university, a vain and egoistical dragon turtle named Plasmorasmus ate the pirate. Afterwards, the turtle had the pirate's treasure melted, and then poured over its armor. However, the mighty being has since gone "civilized" - holding lectures about marine wildlife and geography out of an amphitheater built around a dock. While moody and asocial, the professor is well loved in the port city - and scheming to steal a peace of his gilded armor won't get much support for Ungar and his friends.