Hierophant of the Black Tower

A black tower stands in the center of the city of Lal-Khra'tum and men say it is older that the city, so old that it stood there when the jungles covered the plains instead of desert sands. In all the history of Lal-Khra'tum it has been noted that robed and hooded priests go from that tower to do business with merchants, buying food and wine with their ancient gold, and on occasion slaves that are never seen again. I had long wondered what god was served there and so on a moonless night I climbed that tower and gazed through the barred windows to glimpse the hierophant who dwelt in the uppermost chambers of the tower.
(From the Scrolls of Vecra Tutthoon)

The Kings of Atlantis

"Olney listened to rumors of old times and far places, and heard how the kings of Atlantis fought with the slippery blasphemies that wriggled out of rifts in ocean's floor"
 H.P. Lovecraft, The Strange High house in the Mist

Shoggoth!

Worst toy idea ever.

The Black Book

In his search for ultimate knowledge did not the sorcerer Tellaborabi sign his name in the Black Book of Azathoth? And later, when his frightened acolytes broke down the door to his sanctum they found not an all knowing sage but instead a drooling madman who had clawed out his own eyes.

(from the confessions of Psylacheus the Heretic)

Revenant from the Bog

Those sorcerers of old Hyperborea would cast the bones of a man into a swamp and command elementals to inhabit them. In time those bones would rise covered in the substance of the bog, a shape vaguely like a man but a thing of horror and an affront to the spirits of the earth .
(from the Scrolls of Vecra Tutthoon)

The Primal Giants

Far to the frozen north sailed At'amdra, and there he found an island where dwelt a race of  monstrous giants amid the ruins of a once great city. These savage giants were called the Ith'uuklim by the primitive people who lived on nearby islands and it is said long ago the monsters sought to conquer the young tribes of man. But Nodens had witnessed the vileness of the Ith'uuklim and sent a mighty earthquake to destroy their city, then he caused strange foul vapors to rise from the earth to rob them of intellect. Now the giants roamed the fallen city as animals devouring any living thing they might find and even preying on their own kind when food was scarce.

At'amdra considered a landing on the isle of the Ith'uuklim, for no doubt great treasures remained in the ruins. But wisely sailed on as the place had been cursed by the gods.

 (from the Lemurian Codex)

Innsmouth

 The rotten fish smell of Innsmouth no longer sickened him. A part of him loathed the town and it's vile inhabitants. That part of him, the human part, was weak and frightened, it begged him to run screaming into
the rain until the town was far behind.
    In the street below his open window a priest read from a scroll. The words were older than mankind and
not meant to be voiced by men but the words came easy to the priest. The flabby, drooling, lips spoke with
authority, rising above the din of the storm.
  "Pha'tgn Uig'liu Dagon"
  "Ia Ia Mg'nui CTHULHU"
  "Dagon yath'lei"
  "Ug'liu DAGON"
 They were coming up the stairs. Shambling, bleating, many crawled on limbs more suited to the slimy sea floor. The door opened. No, he would not run from Innsmouth, he would take Dagon's sacrament and reveal his true self, then he would live forever amid the terrible beauty of the Deep Ones.