In the Isle of Shadows, countless resentful spirits and thick fog envelop it, and some of the unjust spirits who were extraordinary in their lifetimes are still powerful and mysterious after becoming immortal and strange beings.

Callista is an immortal vengeful spirit with a chilling hatred for all whistleblowers, fraudsters, and betrayers. During her lifetime, she was a legendary warrior, but in an attempt to avert tragedy, she was betrayed and killed by those she trusted most. Now, she is an undead entity that responds to those requests for revenge, but at a high cost: the soul of the requester is taken away and bound to her forever.

Callista is a vengeful ghost, an immortal vengeful spirit, a nightmare summoned from the Isle of Shadows to hunt down the perfidious.

Victims of betrayal will hope for revenge with blood and tears, but Callista will only pick and choose what she thinks is justified, answer the call, and use her killing skills. Misfortune will inevitably befall all those targeted by Callista, as there is only one way for the Death Hunter to break his vows, and that is through the ruthless aura of her soul javelin.

Callista was a noble general and her uncle was a great king, but no one remembers their kingdom.

She adhered to the code of honor throughout her life, and at the same time demanded the same standards of loyalty from others to her king and queen.

Her king made many enemies, and during an assassination attempt at the behest of a vassal king, Callista was quick to prevent the tragedy from happening. Although the king is safe and sound, Callista has caused misfortune for the queen. The Assassin's blade was poisoned, and Callistag slashed the Queen's arm.

The king summoned all the famous doctors, priests, and magicians, but no one was able to remove the poison from the queen's body. Even the king's own magic could only delay the time of the poison. The grief-stricken king sends Callista out in search of a cure.

Before leaving, Callista instructed "Hecarim of the Iron Order to protect the King's safety in her place", and the latter reluctantly accepted the task, resentful that he had not been promised to go with Callista.

Callista traveled the world, visiting learned scholars, hermits, and mystical places in search of an antidote, but in vain.

Eventually, she heard that there was an island of legends that mortals could not see, and that it was said to hold the secret of eternal life: the island of well-being.

She set sail with her last hope. The inhabitants of Welfare Island knew about her quest and were impressed by her pure motives, so they directed her boat to the beaches of Welfare Island.

Callista begged them to heal the queen, and the island master asked her to bring her to the island and have them purify her body. When Callista returned to the ship, the islanders told her of an arcane spell that she had used to pass through the protective magic curtains around the island of well-being, but the islanders warned her not to reveal the secret to anyone else

。 Callista sailed back to her homeland, but it was too late, and the queen was already dead. The king, driven into madness by his grief, chained himself and his queen's bodies to a tower.

When the king learned of Callista's return, he immediately demanded that she tell her what he had discovered. Callista's heart was heavy, she had never broken her oath of allegiance to the king, but she remembered the islanders' warnings, and knew that it would be useless to return to Welfare Island with the dead body, so she could only refuse to answer.

The king declared her guilty of deceit and put her in prison until she repented. After Callista was imprisoned, Hekarim advised her to report the truth to the king. He urged her to help the king mourn and if he could not resurrect the queen, let him accept the queen's death, and allow the dead to be buried on the island of Blessing.

The two of them work together to ease the King's madness and bring him back to his senses without causing more damage. Calista hesitated, sensing something wrong with Hecarim's proposal, but she agreed.

So the king led a fleet of clippers to the island of Welfare. Callista cast a spell in the sea of her destination, lifting the curtain of magic, and the glittering sand came into view, leaving the king in awe.

He made his way towards the White City in the center of the island, where he was met by the elders of the Guardians of the island. The king commanded the elders to resurrect the queen, but the elders said that escaping death was against the natural laws of the world. Enraged, the King ordered Callista to kill the Elder Guardian.

Callista refused the King's order, reminding him of his former wisdom, but her pleas fell on deaf ears, and the King once again ordered the Elder Guardian to be killed.

Callista asks Hekarim for help, but Hekarim sees a long-planned opportunity to replace Callista as the king's most important general.

He walked over to Callista, as if to petition alongside her, but instead, he impaled Callista with a spear from behind, a betrayal of the devil.

The knights of the Iron Order joined him in betraying Callista, and as she fell, countless spears pierced her body.

A bloody riot broke out, and all the warriors loyal to Callista were desperate to defeat Hekarim and his Knights.

Although they did not lose their courage and skill, they were so different in numbers that the Hekarim men drove them to the ground. Callista could only watch as her warriors were slain, and with her last breath she vowed to pay the blood for all who betrayed her.

When Callista opened her eyes again, her eyes were filled with strange dark magical powers. The island of well-being has been transformed into a mirror image of life and beauty, a dark place of shadows, where weeping ghosts are cursed for eternity and trapped in an endless nightmare.

She didn't know how it all happened, only the memories of her deathbed betrayal did not dissipate, but even these memories slowly faded into nothingness, and all that remained was the desire for revenge, burning in her broken chest.

This craving can only be quelled with use.

And now, the Shadow Isle is infested with ghosts, and Calista's soul has been tormented endlessly for endless years, and the anger and hatred in her chest burn her mind like a fire.

This never-ending suffering is only slightly diminished when Calista bestows the humble life of the betrayer with the spear in his hand.

Calista then responds to the call of all the betrayed, and it doesn't matter, even if it's expensive.