The unknown evil

Horror is both wonderful and sacred I believe. But the question always comes up should I show the antagonist? there are times you should and shouldn't honestly.

Atmosphere is key in the avoidance of showing the thing that is horrifying. Simply implying odd sounds or strange feelings will help a great deal.

I also recommend watching The Blair Witch Project. You never see the witch but you know she is around by shadows and creepy noises. That's my horror tip for the day