Dragon?

A monster was emerging from within the gate, its body so huge that one had to snap their neck up to see the monster's head. Its skin was dark-blue, almost black, and it seemed thick as if it had layers after layers of hard-to-pierce armors instead of skin. The four limbs of the monster were longer than the tallest building in the city and each one of its fingers was as large as a truck. The monster had a tail that looked like the lizard's but in a much larger size, and its whole body was covered in big and small thorns.