Excerpt from CAS' The Seven Geases, a wry, weird, and very misanthropic subterranean travelogue from Hyperborea. Here, a wealthy magistrate on a game hunting trip has unwittingly interrupted an old sorceror's invocations at his remote mountainside abode.
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"May the ordure of demons bemire you from heel to crown!" cried the venomous ancient. "O lumbering, bawling idiot! you have ruined a most promising and important evocation. How you came here I cannot imagine. I have surrounded this place with twelve circles of illusion, whose effect is multiplied by their myriad intersections; and the chance that any intruder would ever find his way to my abode was mathematically small and insignificant. Ill was that chance which brought you here: for They that you have frightened away will not return until the high stars repeat a certain rare and quickly passing conjunction; and much wisdom is lost to me in the interim."
"How now, varlet!" said Ralibar Vooz, astonished and angered by this greeting, of which he understood little save that his presence was unwelcome to the old man. "Who are you that speak so churlishly to a magistrate of Commoriom and a cousin to King Homquat? I advise you to curb such insolence: for, if so I wish, it lies in my power to serve you even as I serve the Voormis. Though methinks," he added, "your pelt is far too filthy and verminous to merit room amid my trophies of the chase."
"Know that I am the sorcerer Ezdagor," proclaimed the ancient, his voice echoing among the rocks with dreadful sonority. "By choice I have lived remote from cities and men; nor have the Voormis of the mountain troubled me in my magical seclusion. I care not if you are the magistrate of all swinedom or a cousin to the king of dogs. In retribution for the charm you have shattered, the business you have undone by this oafish trespass, I shall put upon you a most dire and calamitous and bitter geas."
"You speak in terms of outmoded superstition," said Ralibar Vooz, who was impressed against his will by the weighty oratorical style in which Ezdagor had delivered these periods.
The old man seemed not to hear him.
"Harken then to your geas, O Ralibar Vooz," he fulminated. "For this is the geas, that you must cast aside all your weapons and go unarmed into the dens of the Voormis; and fighting bare-handed against the Voormis and against their females and their young, you must win to that secret cave in the bowels of Voormithadreth, beyond the dens, wherein abides from eldermost eons the god Tsathoggua. You shall know Tsathoggua by his great girth and his batlike furriness and the look of a sleepy black toad which he has eternally. He will rise not from his place, even in the ravening of hunger, but will wait in divine slothfulness for the sacrifice. And, going close to Lord Tsathoggua, you must say to him: "I am the blood-offering sent by the sorcerer Ezdagor.' Then, if it be his pleasure, Tsathoggua will avail himself of the offering."