Failinis

In the Lebor Gabála Érenn tradition Failinis is listed among the eric items belonging to Lugh Lámhfhada and described as the whelp of the smith or king of Iruaith (a mythical Scandinavian kingdom). In later Fenian-cycle ballads and prose a like creature appears in narratives about princes from Iruaith who bring the dog into contact with Fionn mac Cumhaill and the Fíanna; in these tales the three foreign owners swear not to carry the live dog out of Ireland but later kill and flay it to transport its hide. Manuscript variants and late ballad attestations present shifts of ownership, name-forms (Ṡalinnis/Shalinnis, Fer Mac), and certain powers across the Mythological and Fenian layers of the tradition.

Descriptions vary by source. A Fenian ballad calls the hound “a hound of the loveliest color,” mighty and large by day (said to be capable of overcoming fifty men) and at night a ‘thunderbolt, ball of fire’ (Old Irish: caer thened). In prose variants (the Fer Mac/Colloquy material) the dog is described as parti-coloured—displaying shades including white, black, and blue—and larger than other hounds, though in one episode it shrank to the size of a pine marten when dispensing drink. Gender is inconsistently presented across texts.

Across attestations Failinis is credited with martial invincibility (able to overcome many men), dominion over beasts and the capacity to catch all wild creatures including fish, and the supernatural transformation of running water into wine or mead when it bathes (attested in Lebor Gabála and Fenian ballad versions). In Fer Mac/Colloquy prose variants the hound disgorges liquor from its mouth and is said to vomit quantities of gold and silver as needed; that prose also attributes druidic wind-magic (summoning a wind by lifting its tail) and a destructive breath that turns bodies to dust and ashes.