Deltarune is one of my favorite games ever, and I think that it has one of the best soundtracks ever. Despite being an indie game, Deltarune has a better soundtrack than most AAA games out there, but the favorite music from that soundtrack differs between each person. For me, the music "Dark Sanctuary" is the best in this game, and it's atop masterpieces like Hammer of Justice, Guardian and Black Knife! Why's that? It is from chapter 4, which is my favorite chapter despite being the most racist of all chapters (because I am a Muslim person and chapter 4 is based on a church and church is for Christian people so clearly it supports a race more!) and this chapter has the best music of all chapters because at this point, Toby Fox has learnt how to make GOATed music. Second, this music is mostly choir, and choir is my favorite type of music. Third, it just has a vibe of holiness, hope, wisdom and such.
Toby Fox for Mizzle and the music.