Vyrrwolves are demonic wolves that are said to come straight from the Dim World (the wolves equivalent of Hell). It is a wolf that has been infused with vile nachtmagen (dark magic) on a night of a full moon.
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This article contains plot details from one or more of the books.
The vyrrwolves are often portrayed as demonic, larger wolves with yellow eyes and blue-black fur. They are even larger and stronger when there is a full moon. Vyrrwolves are the wolves from the Dim World, so they may be very frightening to some clan wolves. They must be very strong; for it would take many wolves to take even one vyrrwolf down. It is said Vyrrwolves can carve exceptional, profane Gnaw Bones; they are sometimes considered Outclanners.
Before the Books
Before the books, vyrrwolves caused havoc like hagsfiends in the Northern Kingdoms.
The Golden TreeThe young king Coryn and the band left the Great Ga'Hoole Tree to wander the Southern Kingdoms to see if any traces of nachtmagen were to be found. After receiving whispers from Rabbit, the web-reader rabbit, his search led him to Beyond the Beyond. There the owls met with the dire wolves Hamish, Gyllbane, and Cody and told them the purpose of their mission.
When they recounted the legends and the powers of hagsfiends, the wolves became afraid and revealed their knowledge concerning vyrrwolves and their similarities to hagsfiends. They made known that Dunleavy MacHeath had become a vyrrwolf and had taken most of the MacHeath clan to a foul tunnel known as the Tunnel of Despair. Remembering the whispers Rabbit gave, the owls determined that Nyra was in the tunnel seeking to revive nachtmagen and had struck up an alliance with the corrupted MacHeath clan. Coryn, the Band and dire wolf reinforcements assembled for an attack and fought the remnants of the Pure Ones and the vyrrwolves. At the battle's conclusion, all of the vyrrwolves were dead.
They can use fyngrot, like hagsfiends, except they call it the jaunyx.