halloween scene featuring cthulhu summoning glowing jack-o-lantern pumpkin in dark, otherworldly setting

halloween cthulhu monster horror pumpkin cosmic tentacles glowing eerie dark lovecraftian mythos creature spooky nightmare eldritch alien fantasy mystical occult sinister jackolantern supernatural terror enigmatic otherworldly abyss fear ancient legend myth creepy haunted dread unearthly chilling mysterious grotesque occultism mystic ominous surreal ghastly spinechilling cryptic macabre shadows malevolent