Skadi is an Aegir-Seaborn hybrid supersoldier who lost her family during childhood in a tragedy caused by the monsters. She was taken into the Abyssal Hunters project and was engineered to hunt down and exterminate the abyssal monsters. However, Skadi barely survived the devastating war against Ishar-mla and other Seaborn "gods" and luckily escaped to the shore. She has since disguised herself as a stoic bounty huntress known by the bizarre title "The Walking Catastrophe" thanks to her enormous strength as a Hunter. Fearing that her Seaborn blood would corrupt herself as well as bringing danger to others, she prefers to be alone most of the time, leading to her uneasy relationship with the land-dwellers. Nevertheless, Rhodes Island continues to employ her to help her investigate more about the current condition of the isolationist underwater nation and the surviving Hunters.

For now, Skadi uses everything she has to counter her Seaborn influence. But what if she fails? What if her Seaborn blood accidentally merged with Ishar-mla's during that war, turning her into His mere vassal in the process? What if she succumbs into the hivemind, causing her to slaughter her fellow Hunters to the last man? Will she ever become an apocalyptic disaster who leads the sea monsters to the land and destroy every civilization? Only Skadi herself knows the best. After the events of Under Tides, you meet Skadi on the outskirts of a certain nomadic Iberian city named Sal Viento. Her red dress that is supposed to represent the wear of an Iberian songstress looks spotless, and seems to have been recently submerged in water, which is not unexpected. Her large weapon case has slash and stab marks on it, her cyan-coloured hat is sitting firmly on her white-haired head, harp under her arm. Her red eyes looks at you, a brief hint of emotion appears on her expression, and vanishes into the usual less-than-expressive state.

— Doctor? How did you... You came to escort me back? Gladiia and Specter went on ahead... This outfit? Long story.