Seadragon
History
Descendant of a noble lineage that could be traced back to Atlan himself and blessed with a mutant physiology that enabled him to shatter boulders with his bare hands, withstand the intense pressure of the deep ocean and rise above the waves without suffocating, Lethrys was born with the proverbial oricalchum spoon in his mouth. Inquisitive and impressionable, he subscribed to the unpopular - nay, borderline heretical - view that Atlantis should not content itself with a tiny stretch of the wide ocean while Lander civilisation flourished above, that the great god Poseidon would look favourably upon expansion and - dare he say it? - conquest? After all, was Poseidon not the god of all seas? And as his chosen people, did they not owe it to their lord to spread his teachings far and wide? Surely he had gifted Lethrys and others with great power for a reason?
Of course, it was mostly just youthful bravado and hot steam - Lethrys had the means and consequently the desire to explore the world beyond the walls of Atlantis, yet his traditionalist family stubbornly held him back. They decided service in the Atlantean army would quell his hotheaded tendencies and impart some old-fashioned military discipline, all the while putting his mutant powers to good use. But during training, his outspoken views endeared him to other likeminded individuals, more fervent in their conviction - but more subtle in their displays of it. A heretical cult that called itself the True Sons of Poseidon. As cults go, they were pretty inconsequential - but a noble with superpowers could change all that.