The Madness of Cormac

"The Madness of Cormac" is from an undated letter that Robert E. Howard wrote to Tevis Clyde Smith:

Lock your arm of iron
Around the reeling moon,
Draw your sword, the grey sword,
The sword of Fin, the fey sword,
Carved with a nameless rune.

Brace your feet like talons
On the dreaming world,
Break the shapes, the dread shapes,
The dragon-things, the red apes,
Out of the abyss hurled.

Ghosts of all the ages
Fill the ancient skies,
Red queens and white kings,
Nameless forms and night things,
Men fools and wise.