League of Legends in Multiverse

A Sky Dragon that had once been slain in Valoran!

P.S. The Prince of Demacia had a "Dragon Slayer" skin based on his journey across Valoran, where he slew a Sky Dragon and saved the "Dragon Blood Warrior," Shivan.

Also, don't be surprised that the protagonist possessed both the Hero Abilities of "Dragon King" and "Dragon Slayer." After all, he was a Summoner~~~ A hodgepodge was perfectly normal~~~.

109, Changjiang Knight

Siegfried could slay Fafnir. Did that mean no other heroes could slay dragons?

Of course not.

As the pinnacle of Phantasmal Species, Dragon Kind left traces of its existence in every dimensional world. Correspondingly, there were probably just as many weapons and heroes that possessed the "Dragon Slayer" attribute as there were dragons.

Dark crimson energy surged upward and swallowed Fafnir, just as the Sea Demon had been obliterated beneath the Anti-City Noble Phantasm Excalibur.

True to the name "Artillery Mode," the "arrow" formed around the shaft of the Guan Dao shot forth like a large-caliber energy cannon, its blade piercing straight through the Evil Dragon's body.

However, the Noble Phantasm rank of "Five Weapons of the War God: Artillery Mode" could not compare to the legendary Excalibur, and Fafnir was far beyond comparison to an ordinary Sea Demon—after all, not every Sea Demon was Cthulhu. But superior dragons were, no matter what, the pinnacle of Phantasmal Species, and Fafnir was renowned even among Evil Dragons for her strength.

(P.S. In the setting, the holy elven sword Excalibur was forged from a Star Core. Well, no matter how much I wanted to hype up Lu Bu, the Guan Dao really couldn't compare...)

However, unlike FGO's Berserker Lu Bu Fengxian, Lianye's long halberd carried a special attack effect against Dragon Kind—and Fafnir was a "dragon."

With all those factors