The Bloody Wolves are an enemy, and that Kevin, if he is a Dervish (Dark-Dark) can transform into at night, that are in the game, Seiken Densetsu 3. They are primarily located within the Moonreading Tower.
The Bloody Wolves, found only within the Moonreading Tower, have an very high attack stat, coupled by the fact that their wolf forms give them a 2.5 multiplier, can make them very dangerous foes for a party who are not properly armored. They have no elemental weaknesses, no saber weaknesses, and they are impervious to the Moon Saber.
Since the Bloody Wolves are an equivalent to Kevin's Dervish, they happen to know Kevin's martial art attacks, plus they know Sukazu Sky Dance.