This is just a simple audio replacement mod made possible thanks to the CustomSounds mod.
This mod only replaces 1 audio event (technically it's 3 different audio tracks but 2 have been replaced with "empty" audio files). Whenever you observe a dead body or encounter a Forest Giant the Call of The Witch sound effect from the popular anime Re:Zero will play. I was inspired to create this because of a clip from AmaLee where she had edited the effect in herself, because of which I came to the conclusion that this needed to be made into a mod.