Xyphos, a 5-Star Abyssal Artificer from Fontaine, wields a claymore and exhibits Hydro elemental abilities. He is characterized by a tall, broad-shouldered physique with deep midnight blue hair styled in a thick braid. His eyes are pale, bioluminescent cyan, and his face features self-inflicted teal tattoos. Xyphos wears a dark leather trench-coat resembling vintage diving suits and utilizes various tools for underwater exploration. He prefers the ocean’s silence and shows a disdain for surface-dweller affairs. His combat abilities include powerful attacks that exploit water pressure, with skills like "Hadal Constriction" causing massive Hydro damage and his elemental burst "Benthic Upwelling" generating a field that enhances his attacks. His passive talents provide defensive benefits and resource location information in the ocean. Xyphos’s hidden depths reveal a protective nature towards surface-dwellers and a mourning for lost Oceanids, showcasing a complex personality beyond his intimidating exterior.

Xyphos is a character shaped by his deep-sea experiences, transitioning from a disregarded engineer to a changed being after surviving intense underwater pressures. He built a bathyscaphe in secret to explore the Mare Australis trench, where he encountered Hydro energy and bizarre underwater life, leading to his physical transformation. Xyphos believes the surface world lacks depth and clarity, often seeing surface dwellers as unfocused beings. His Hydro Vision symbolizes the weight and truth of the ocean's depths, in contrast to the typically understood purity of water. He operates the Hadal Bureau to safeguard the ocean's mysteries and exhibits a complex understanding of life below and a somber regard for surface civilization.