Nobody within the Meridian Syndicate knows exactly when Brimstone first came into the service of Magister Thaddeus Wycliffe. Some claim the Hellhound was part of the bargain through which Wycliffe first gained his position within the Crossroads Cult, while others insist that Wycliffe summoned the creature himself after discovering its true name in a manuscript obtained from a private collection in Boston. Wycliffe has never bothered to correct either version. When questioned, he merely describes Brimstone as an old and particularly loyal companion.

The description seems strangely appropriate. Despite its monstrous appearance, Brimstone behaves around Wycliffe much as a well trained hunting dog might behave around its master. It follows him when permitted, settles beside his chair during meetings of the Cult and appears genuinely pleased when praised. Wycliffe reciprocates the affection, occasionally scratching the creature behind one scorched ear while discussing matters of railway finance, occult ritual or murder as though there were nothing remotely unusual about the situation.

To everyone else, Brimstone is considerably less agreeable. The Hellhound seems able to sense fear and takes particular pleasure in slowly approaching anyone who displays it. Smoke escapes from its nostrils, its breath carries the smell of burning coal and its claws leave blackened marks upon wooden floors. Railway employees unfortunate enough to encounter the beast have occasionally convinced themselves that they saw an exceptionally large dog lurking near Wycliffe’s private carriage. Those who have seen Brimstone clearly are rarely inclined to discuss the experience afterwards.

Wycliffe does not normally keep Brimstone permanently within the mortal world. When the Hellhound is required, the Magister summons it through the powers granted to him by the Cult. Brimstone usually appears from darkness, smoke or flame, although on one memorable occasion it simply emerged from beneath a stationary railway carriage where no creature of its size could possibly have been hiding. Wycliffe greeted it with a quiet, “There you are, old fellow,” and continued his conversation.

Brimstone is particularly useful when the Meridian Syndicate needs someone found. Once given the scent of a man or woman, the Hellhound pursues its quarry with an enthusiasm that borders upon obsession. Distance provides little protection, and darkness provides none at all. Wycliffe has consequently developed the habit of keeping small personal items belonging to particularly troublesome individuals. A glove, handkerchief or scrap of clothing placed beneath Brimstone’s nose can be considerably more effective than employing a dozen detectives.

Yet Wycliffe does not regard Brimstone merely as a weapon. Among men whose loyalty can be purchased, frightened or bargained away, the Hellhound may be the closest thing the Magister has to a genuine friend. Whether Brimstone feels anything resembling affection in return is another question entirely.

Wycliffe has never considered it necessary to ask.