
Sounds from freesound.org:

knock knock knock.ogg by patchen -- https://freesound.org/s/8984/ -- License: Attribution 4.0
Creepy Stinger Laugh by Dpoggioli -- https://freesound.org/s/213608/ -- License: Attribution 4.0
"Behind you" whisper by pjhodson -- https://freesound.org/s/223412/ -- License: Creative Commons 0
clown laugh by scotcampbell -- https://freesound.org/s/263708/ -- License: Creative Commons 0
breathe.wav by Erdie -- https://freesound.org/s/22039/ -- License: Attribution 4.0
heart beat increasing 116642.wav by klankbeeld -- https://freesound.org/s/181805/ -- License: Attribution 4.0
creatures-cry.wav by MinigunFiend -- https://freesound.org/s/175206/ -- License: Creative Commons 0
creatures-long-growl.wav by MinigunFiend -- https://freesound.org/s/175211/ -- License: Creative Commons 0
deep-tapping-or-dripping-03.wav by MinigunFiend -- https://freesound.org/s/175213/ -- License: Creative Commons 0
deep-fizzle.wav by MinigunFiend -- https://freesound.org/s/175214/ -- License: Creative Commons 0
Demonic Woman Scream.wav by nick121087 -- https://freesound.org/s/333832/ -- License: Creative Commons 0
Cthulhu growl.wav by cylon8472 -- https://freesound.org/s/249686/ -- License: Attribution 4.0
Scary Ghost Wolf Howling.wav by BrainClaim -- https://freesound.org/s/267179/ -- License: Creative Commons 0
Giant Wolf Howl by NaturesTemper -- https://freesound.org/s/712068/ -- License: Attribution 4.0
Monster Sound Effects 1.wav by AudioPapkin -- https://freesound.org/s/472595/ -- License: Creative Commons 0
Monster Sound Effects 2.wav by AudioPapkin -- https://freesound.org/s/472597/ -- License: Creative Commons 0
Monster Sound Effects 8.wav by AudioPapkin -- https://freesound.org/s/472604/ -- License: Creative Commons 0