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When I DM there are a couple of tricks I use to create an eerie feel.
-extra rolls. Everyone roll a d20 and hand your character sheet to me. Ok, hmm, right. All right you all see a set of sinister doors in front of you... This creates some tension & jumpy PC's
-have them make skill checks that actually tell them things that are not important to the plot, but to atmosphere. The stains on the wall are not human blood, you see a flash of movement out of the corner of your eye. whatever was there is now gone. You find tracks you follow them a few yards and they simply vanish.
-"boxed text" use this rarely, because PC's have to listen & not have a chance to react. You see your breath freeze as you enter this room, you are lifted off the floor & start weeping blood as a woman's sobbing voice relates a story of death through your blue lips.
-FatR hit it right on the nose with PC's. Have some tag along & get to know your PC's. Then put them in danger, kill them (be careful with that one), or hurt them. The NPC's terror will rub off on your PC's.
-Encourage players help. As your DM this is the atmosphere I'm going for. Please take some time to think about what your characters personalities will have to contribute to this setting. Great role playing fun to be had.
Just some other ideas.