Lovecraft circle Seal

…a tall, lean man of dead black coloration but without the slightest sign of negroid features: wholly devoid of either hair or beard, and wearing as his only garment a shapeless robe of some heavy black fabric. His feet were indistinguishable because of the table and bench, but he must have been shod, since there was a clicking whenever he changed position. The man did not speak, and bore no trace of expression on his small, regular features. He merely pointed to a book of prodigious size which lay open on the table.
~ HPL , The Dreams in the Witch-House

The Black Man is an avatar of Nyarlathotep who coerces people into signing the black Book of Azathoth.

When traveling in the fourth dimension he looks like a large wisp.

He leaves half-circle-shaped prints behind him, suggesting that he has hoofed feet.

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