I saw that it followed closely the shadow of Avyctes, keeping ever the same distance. And it fluttered not in the wind, but moved with a flowing as of some heavy, thick, putrescent liquid; and its color was not blue nor purple nor black, nor any other hue to which man’s eyes are habituated, but a hue as of some unearthly purulence; and its form was altogether monstrous, hav- ing a squat head and a long, undulant body, without similitude to beast or devil.
Avyctes heeded not the shadow; and still I feared to speak, though I thought it an ill thing for the master to be companioned thus. And I moved closer to him, in order to detect by touch or other perception the invisible presence that had cast the adumbration. But the air was void to sunward of the shadow; and I found nothing opposite the sun nor in any oblique di- rection, though I searched closely, knowing that certain beings cast their shadows thus.
After a while, at the customary hour, we returned by the coiling stairs and monster-flanked portals into the high house. And I saw that the strange adumbration moved ever behind the shadow of Avyctes, falling horrible and unbroken on the steps and passing clearly separate and distinct amid the long umbrages of the towering monsters. And in the dim halls beyond the sun, where shadows should not have been, I beheld with terror the distorted loathly blot, having a pestilent, unnamable hue, that followed Avyctes as if in lieu of his own extinguished shadow. And all that day, every- where that we went, at the table served by specters, or in the mummy-warded room of volumes and books, the thing pursued Avyctes, clinging to him even as leprosy to the leper. And still the master had perceived it not; and still I forbore to warn him, hoping that the visitant would withdraw in its own time, going obscurely as it had come.
But at midnight, when we sat together by the silver lamps, pondering the blood-writ runes of Hyperborea, I saw that the shadow had drawn closer to the shadow of Avyctes, towering behind his chair on the wall between the huge sculptured women and the mummies. And the thing was a streaming ooze of charnel pollution, a foulness beyond the black leprosies of hell; and I could bear it no more; and I cried out in my fear and loathing, and informed the master of its presence.
Beholding now the shadow, Avyctes considered it closesly and in silence; and there was neither fear nor awe nor abhorrence in the deep, graven wrinkles of his visage. And he said to me at last:
“This thing is a mystery beyond my lore; but never, in all the practice of my art, has any shadow come to me unbidden. And since all others of our evocations have found answer ere this, I must deem that the shadow is a veritable entity, or the sign of an entity, that has come in belated response to the formula of thesorcerers, which we thought powerless and void. And I think it well that we should now repair to the chamber of conjuration, and interrogate the shadow in such manner as we may, to inquire its nativity and purpose.”
We went forthwith into the chamber of conjuration, and made such preparations as were both necessary and possible. And when we were prepared to question it, the unknown shadow had drawn closer still to the shadow of Avyctes, so that the clear space between the two was no wider than the thickness of a necromancer’s rod.
Now, in all ways that were feasible, we interrogated the shadow, speaking through our own lips and the lips of mummies and statues. But there was no determin- able answer; and calling certain of the devils and phan- toms that were our familiars, we made question through the mouths of these, but without result. And all the while, our magic mirrors were void of any reflection of a presence that might have cast the shadow; and they that had been our spokesmen could detect nothing in the room. And there was no spell, it seemed, that had power upon the visitant. So Avyctes became troubled; and drawing on the floor with blood and ashes the ellipse of Oumor, wherein no demon nor spirit may intrude, he retired to its center. But still within the ellipse, like a flowing taint of liquid corruption, the shadow followed his shadow; and the space between the two was no wider than the thickness of a wizard’s pen.
Now, on the face of Avyctes, horror had graven new wrinkles; and his brow was beaded with a deathly sweat. For he knew, even as I, that this was a thing beyond all laws, and foreboding naught but disaster and evil. And he cried to me in a shaken voice, and said:
“I have no knowledge of this thing nor its intention toward me, and no power to stay its progress. Go forth and leave me now; for I would not that any man should witness the defeat of my sorcery and the doom that may follow thereupon. Also, it were well to de- part while there is time, lest you too should become the quarry of the shadow and be compelled to share its menace.”
Though terror had fastened upon my inmost soul, I was loath to leave Avyctes. But I had sworn to obey his will at all times and in every respect; and more- over I knew myself doubly powerless against the adum- bration, since Avyctes himself was impotent.
So, bidding him farewell, I went forth with trem- bling limbs from the haunted chamber; and peering back from the threshold, I saw that the alien umbrage, creeping like a noisome blotch on the floor, had touched the shadow of Avyctes. And at that moment the master shrieked aloud like one in nightmare; and his face was no longer the face of Avyctes but was contorted and convulsed like that of some helpless madman who wrestles with an unseen incubus. And I looked no more, but fled along the dim outer hall and through the high portals giving upon the terrace.
A red moon, ominous and gibbous, had declined above the terrace and the crags; and the shadows of the cedars were elongated in the moon; and they wavered in the gale like the blown cloaks of enchanters. And stooping against the gale, I fled across the terrace toward the outer stairs that led to a steep path in the riven waste of rocks and chasms behind Avyctes’ house. I neared the terrace edge, running with the speed of fear; but I could not reach the topmost outer stair; for at every step the marble flowed beneath me, fleeing like a pale horizon before the seeker. And though I raced and panted without pause, I could draw no nearer to the terrace edge.
At length I desisted, seeing that an unknown spell had altered the very space about the house of Avyctes, so that none could escape therefrom to landward. So, resigning myself in despair to whatever might befall, I returned toward the house. And climbing the white stairs in the low, level beams of the crag-caught moon, I saw a figure that awaited me in the portals. And I knew by the trailing robe of sea-purple, but by no other token, that the figure was Avyctes. For the face was no longer in its entirety the face of man, but was become a loathly fluid amalgam of human features with a thing not to be identified on earth. The transfiguration was ghastlier than death or the changes of decay; and the face was already hued with the nameless, corrupt and purulent color of the strange shadow, and had taken on, in respect to its outlines, a partial likeness to the squat profile of the shadow. The hands of the figure were not those of any terrene being; and the shape beneath the robe had lengthened with a nauseous undulant pliancy; and the face and fingers seemed to drip in the moon- light with a deliquescent corruption. And the pursuing umbrage, like a thickly flowing blight, had corroded and distorted the very shadow of Avyctes, which was now double in a manner not to be narrated here.
Fain would I have cried or spoken aloud; but horror had dried up the fount of speech. And the thing that had been Avyctes beckoned me in silence, uttering no word from its living and putrescent lips. And with eyes that were no longer eyes, but had become an oozing abomination, it peered steadily upon me. And it clutched my shoulder closely with the soft leprosy of its fingers, and led me half-swooning with revulsion along the hall, and into that room where the mummy of Oigos, who had assisted us in the threefold incantation of the serpent-men, was stationed with several of his fellows.