The first seshas transformed out of what was Zipacna's tongue. The sesha dragons are giant cobra dragons that are as long as two elephants and as wide as a human's chest, not including their hood. Though not as large or as strong as their serpent cousins, when seshas breath fire, they also spit out liquid flames that can burn long after they close their mouths. There was once a dev civilization that welcomed seshas into their society. Though I do not know how or why this relationship ended, I know that the result devastated the sesha population.