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Nightmare Fuel: Guild Wars
The Madness Titans that make the sounds of pigs or babies squealing as they tear you and your party apart. That and the Dreadspawn Maw found in the Domain of Anguish, which looks like a giant vagina surrounded by teeth and claws that continually moves in and out.
Your commanding officer/mentor-friend in Nightfall, Kormir, has her eyes eaten out by a demon fittingly named the Hunger. The same demon who, if you believe local rumors, has been devouring army recruits and hapless villagers left and right.
The Realm of Torment. Covered in fleshy walls, random teeth, and at one point you have to cross a bridge made by what seems to be the underbelly of a giant dead centipede. Most of the time, its deathly silent, only making the clicking noise of a giant Torment Claw bursting up behind you twice as terrifying. And the things the spirits trapped down there say...
"There's a song in the center of the earth, my friend, and it sounds like razors through flesh..."