Thrasios

Thrasios, Triton Hero is a legendary merfolk wizard from Theros.

History
He is a triton, one of the few living alongside the humans in the massive coastal polis of Meletis. Meletians saved Thrasios's family from a pack of marauding minotaurs, so he now fights for the honor of Meletis. An accomplished warrior, his prowess in battle is said to be miraculous; no blow ever seems to land on him.

He believes he possesses the divine sanction of Thassa, god of the sea, and for this reason he has left his home and has embarked on a pilgrimage to the ocean's depths at the edge of the world. He claims to have visited the ruins of the fabled polis of Olantin on his most recent expedition, but few believe him.