The veils between the worlds may be at their thinnest on Samhain, but the darkest night of the year is now upon us. Walpurgis Night. The Eve of Beltane. The Night of the Witches, when those dark beings meet on the Brocken mountain and hold revels with their gods. Bar the door and shutter your windows upon this May Eve. For tonight, the darkness takes shape.
Each night, the people of Arkham cowered behind their flimsy wooden doors, terrified of what lurked beyond. But it was the the Beltane Eve, the night of Walpurgis, that the old men of Arkham still speak of in whispered words and phrases. They say that the hills burned with an unnatural glow that night, that satanic psalms floated down to the town below, as creatures of darkness danced and gibbered in the moonlight.
Read more in my book, That Which Should Not Be.