The Death of a Hero

In the prophecy, there are five heroes.
Five heroes who will save the land of Judicia, a continent on a planet named Mora.
After terrible tragedy struck Judicia, the 6 countries it held fell to the reincarnation of the Fallen King, a sky-scraping monster, who now roams Judicia, unchallenged. Just like he had 500 years ago.
In the prophecy, there are five individuals.
The first is Gambit, a 32 year-old widowed human and weapons master from Wauster, the northern most country on Judicia and the eldest hero of the five.
The second is Caspess, a timid 25 year-old half goat man who tried to live a modest life in the countryside of Athal after an incident that left him traumatized.
The third is Vilja, a viscous 23 year-old who had only truly known the vast forestry and wilderness of Iustrana, her devotion to nature sometimes makes her disagreeable.
The fourth is Berkan, a 12 year-old boy from the slums of Trixel who possesses bird-like features, immense strength, and is the youngest hero of the five.
And the fifth is Serena, a 17 year-old who hailed from Ka'Took and possessed the blood of Sagittarius, a god in the world of Mora who stood for accuracy and prophecies.
In the prophecy, there are five friends.
Summoned by the queen of the last standing country of Judicia, Runefall, the queen is determined to save Judicia after her discovery of the prophecy in her castle's archives. She tells them that they must go forth and vanquish the Fallen King, but there is a cost.
In the prophecy, there are five hearts.
But by the end of it, only one of them will continue to beat. And Serena, the only one destined to survive the prophecy, will do everything in her power to save her newfound friends. But fighting destiny is never easy, and the five must fight and gather the relics of the past that were used to defeat the Fallen King 500 years ago.
All the while running from the beast himself.
Can Serena change her friends fate, or were they doomed to die from the start?