I couldn't find a full song that had the slow and reverbed effects so I made one myself.
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I do apologies if the audio is terrible since its my first time making a audio like this and I made it with cap-cut.
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I did do some digging on how to make a reverbed and slowed audio so I do hope it sounds good for y'all.
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OG SONG (i think): Muzan vs Hashira | Entrance to Infinity Castle | Demon Slayer S4 E8 | 鬼滅の刃 OST

LINK:    • Muzan vs Hashira | Entrance to Infini...