The Wolves From Strange Aeons For Your Old School Campaigns

Carried on the Boreas winds from the Outer Darkness there are things that slip between the cracks of reality, resembling lean and hungry wolf like demonic things. The wolves from strange aeons glide along the half real psychic winds winding their way across the planes and dimensions. They are ancient and hungry Lovecraftian horrors that come to feed when they cross the dimensional threshold onto a plane. Until this happens the wolves exist as a hazy ghostly outline and can only be damaged by magical or certain technological artifacts. 

Those who cross the threshold into the Astral or edge's of the planes risk being hunted by these things. 

There are hints of these horrors that wait beyond the Outer Darkness for one misstep by adventurers. Lovecraft hints about them Though the Gates of the Silver Key: 

"There were hints of it in the cryptical Pnakotic fragments, and a whole chapter in the forbidden Necronomicon of the mad Arab, Abdul Alhazred, had taken on significance when he had deciphered the designs graven on the silver key. A gate had been unlocked - not, indeed, the Ultimate Gate, but one leading from Earth and time to that extension of Earth which is outside time, and from which in turn the Ultimate Gate leads fearsomely and perilously to the last Void which is outside all earths, all universes, and all matter.

The Affair that shambleth about in the night, the evil that defieth the Elder Sign, the Herd that stand watch at the secret portal each tomb is known to have and that thrive on that which groweth out of the tenants thereof: - all these Blacknesses are lesser than HE WHO guardeth the Gateway: HE WHO will guide the rash one beyond all the worlds into the Abyss of unnamable devourers. For He is 'UMR AT-TAWIL, the Most Ancient One, which the scribe rendereth as THE PROLONGED OF LIFE."

Ages ago, a Hyperborea sorcerer called upon these horrors and now the gateway is open and these things can appear anywhere but seem to haunt the edges of reality and they come to fed on the souls of all. Only the symbols of 'UMR AT-TAWIL, the Most Ancient One, can keep these things at bay. 

The Wolves From Strange Aeons

No. Encountered: 1d6 (1d6+6)

Alignment: Chaotic Evil 

Size: L

Dexterity: 8

Armor Class: 5 

Hit Dice:6 

No Attacks: 1 (bite)

Damage: 2d4

Saving Throw: 15 

Morale: 9 

Experience Points : 500 

Treasure Type: -

These monsters are at home in both urban environments, the most frozen tundra, and even temperate regions of reality. These horrors are made up of strange and weird shifting tendril like flesh growths that takes the place of real flesh. Even as one watches these wolf like demonic horrors it becomes apparent that these things are nothing less then mere mockeries of life as we know it. They appear as strange semi shadowy nightmarish things in packs only gain solidity in an instant in order to crush flesh, bone, and souls like with mighty tendriled bites. They are immune to cold, take half damage from electricity, and the airless void of space.  Once every six rounds they may let loose a bone chilling howl which will cause fear as per the spell or create what is known as 'the autumn wind'. A blast of soul searing unreality in the form of a cone of eye searing horror, the blast is ten foot long and ten foot wide at its terminus. The blast causes 4d6 hp damage with an avoidance save allowed for half damage. 

The wolves from strange aeons then come to feel on what remains of their victims including the souls of the poor fools who are their victims. Those who survive an attack by the wolves will live in utter fear of these horrors and there is a 30% chance of the keen and twisted alien minds of these horrors remembering the true names of their victims and tracking them down months, years, or decades later to murder them in their sleep.
The wolves from strange aeons loath winter wolves of Hyperborea but are often summoned by the Men of Leng, their lord is the enemy of Ythaqqa. The wolves may be given pause he strides the winds of Winter and terror.

The wolves may be summoned by an evil 4th level black magick rite at certain twisted sites and where weird spires around the edges of Hyperborea  are found. Places where the Boreas winds blow and they come to sup and sup well on the souls of men where they are summoned by those who remember the old ways of Hyperborea. But then again these monsters may be found anywhere that the old religions of Hyperborea are practiced and the hills ran red with the blood of innocents.