This sound is from Yone - League of Legends Soundboard

Yone, the Unforgotten, is a formidable swordsman from the spirit realm of Runeterra. Once a renowned student of his village's sword school, he was tragically slain by his younger half-brother, Yasuo, while attempting to protect their master from a demonic spirit. Yet, Yone's spirit was unwilling to rest, and he found himself bound to the mortal realm, tasked with eliminating the malevolent entity that had claimed his life. Armed with his signature katana, Dawnbringer, Yone embarks on a relentless quest to purify the spirit realm and find redemption for his past mistakes.