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)

Last of the Dragons

In the time of the first men the ancient dragons made war on the dark lords of the chaos realms, seeking to end the influence of the demon spawn upon mankind before the young race grew numerous and covered the world. 

But the demon prince Su'Kru-Ital devoured the King of Dragons and a third of the dragons were destroyed by the demonic hordes. The dragons retreated to meditate upon their defeat and fully a third more died from grief in that first millennium of contemplation. 

And so by the apex of the Hyperborean age  of sorcery only eight dragons were thought to exist and of those only Suroc’ur was known by name.

( The Lemurian Codex)  

Adompha's Garden

"And there were many other weird plants, diverse as the seven hells, and having no common characteristics other than the scions which Dwerulas had grafted upon them here and there through his unnatural and necromantic art.
These scions were the various parts and members of human beings. Consumately, and with never faillng success, the magician had joined them to the half-vegetable, half-animate stocks on which they lived and grew thereafter, drawing an ichor-like sap. "
 (from "The Garden of Adompha" by Clark Ashton Smith)