there's the khezu's theme from monster hunter, but I can't post that because it is LITERALLY SILENCE. the only thing you're gonna hear during the fight with the khezu is the cave ambience, the khezu's occasional grunts and screams, and the sound of him charging his
loving broken cheap ass electric attacks
it also doesn't help that he looks like this:

so yeah. it's quite up there on the creepy factor.
there's also the
third dungeon theme from the criminally underrated
bootleg Diablo clone Fate, that scared the haboobles outta me as a kid.