Pomru

Description

As big as a small mountain this blue creature brings destruction to the people around it. It Burns their houses kills their defenses. The Ancient dragon Pomru has lived on The Scorching Lands for over 500 years. Around his hoard a Kobolds and Dragonborn village was created. In the name of Pomru these followers of her raided the village's of The Scorching Lands and bring all sort of treasures to the Big Blue Dragon.
The witch Proko got so fed up with this Blue Monster that she traveled away. On her way she found some magic users that said they would have a solution for her Dragon problem. She signed some sort of contract and the mages teached her their ways. Due to this training and her enormous amount of willpower, Proko succeeded in casting the most powerfull sleep spell ever created. Now the Dragon is asleep in is hoard. Defended by it's former followers. The Dragonborn and Kobold people of The Scorching Lands learned to live in harmony with the other races of the land. But they all fear they day Pomru wakes up.
Stats: https://www.dndbeyond.com/monsters/ancient-blue-dragon