"Are you serious?"
"Of course."
Dumbledore hinted to Karl, "After Gáe Bolg pierces an enemy, the barbs on the spear instantly disembowel them. Its master, Cú Chulainn, was also pierced to death by this magic spear."
Karl instantly thought of Fawkes, who had been turned into a pincushion, and what Elvis Heller had said: This spear was stained with a trace of that person's divine might.
"So, the monstrous form Elvis Heller took after piercing himself with the spear was Cú Chulainn?"
"Correct. Legend says that during battle, Cú Chulainn would transform into a terrifying form. The description matches what we saw. The 'person' Elvis Heller referred to must be him."
Dumbledore tapped the Spiral Sword in the stone box again. "And this Caladbolg, it was the weapon of Cú Chulainn's friend and foster father, Fergus mac Róich. It possesses the power of lightning, enough to shatter mountains."
Professor McGonagall and Professor Flitwick exchanged glances, both recalling that dangerous flash of lightning from back then.
"If that's the case, then what is the relationship between Herpo the Foul and Cú Chulainn? And why did he invent the Horcrux, attempting to save him from some existence?" (Chapter 49)
Karl scratched his head. It was so itchy; was he about to grow a brain?
Dumbledore stroked the white beard on his chest, a strange expression on his face.
"This involves the Tuatha Dé Danann in Celtic mythology. Cú Chulainn's biological father was Lugh, the Sun God. This Sun God's origins are quite legendary."
"Simply put, the Tuatha Dé Danann and the Fomorians were at war. Balor, the King of the Fomorians, received a prophecy from a druid that he would die at the hands of his own descendant, so he imprisoned his daughter, Ethniu."
"Unexpectedly, with the help of a female druid, the minor god Saan of the Tuatha Dé Danann fathered three children with Ethniu."
Karl, Professor McGonagall, and Professor Flitwick:
No wonder Dumbledore had that expression; this matter was truly too abstract.
These two druids were really hard to judge. Were they not doing this on purpose?
"Balor was furious upon learning this and ordered his subordinates to throw the three children into the sea to drown."
"However, one of them was found by a member of the Tuatha Dé Danann. This child was the future Lugh, the Sun God."
Karl widened his eyes and looked at Dumbledore, quickly thinking of a possibility, his tone filled with disbelief. "This member of the Tuatha Dé Danann couldn't be the Lord Herpo the Foul that Elvis Heller mentioned, could he?"
Dumbledore nodded. "Yes, the god of craftsmanship of the Tuatha Dé Danann was named Herpo the Foul. Given his relationship with Lugh, the Sun God, it would be quite normal for him to want to save Cú Chulainn."
At that moment, Karl felt completely numb. "So it seems Elvis Heller wasn't lying. Then the magic core of the Castle is really..."
"Correct, it is the stone of destiny, one of the four treasures in Celtic mythology."
No wonder the four founders of Hogwarts didn't know how to use the stone of destiny, while Herpo the Foul did. After all, he was the god of craftsmanship, and it was a treasure of his own race.
Dumbledore continued: "As for why Herpo the Foul invented the Horcrux to save Cú Chulainn, it is because his opponent was the goddess of death, Morgana."
"According to records, Morgana fell in love with Cú Chulainn but turned to hatred, becoming his enemy and weaving a tragic Destiny for him."
"After Cú Chulainn died, his soul was destined to belong to the goddess of death. I suspect Herpo the Foul could only use a Horcrux to forcibly retain a part of Cú Chulainn's soul."
Hearing Dumbledore speak to this point, Karl finally understood the situation. "Since the fragmented soul could only stay in the limbo, unable to enter The Otherworld, Herpo the Foul borrowed Merlin's idea."
"He tampered with the magic core when creating the Castle, wanting to use—let's call her Moaning Myrtle—wanting to use Moaning Myrtle's spirit to complete Cú Chulainn's soul."
After finishing, Karl looked at Dumbledore's affirmative gaze and couldn't help but let out a deep sigh.
"Principal, is it possible that we are overthinking this? The spear and the Spiral Sword are just coincidences, and Elvis Heller is really a psychopath?"
"That is not possible, because the magic core of the Castle is indeed the stone of destiny." Dumbledore pointed to the repaired ravenclaw diadem. "Do you remember what I told you about the reason the diadem could be repaired?"
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