The "Slowed + Reverb" genre recontextualizes familiar songs to evoke a sense of melancholy or "aesthetic" nostalgia.
It serves as the primary battle theme for the Espada , a group of high-ranking "Arrancar" (hollows with soul reaper powers). La Espada Slowed Reverb
What's the appeal of “Slowed + Reverb” : r/LetsTalkMusic The "Slowed + Reverb" genre recontextualizes familiar songs