Their rivals for the stones are Diesel 's medieval-esque cousin , Gerwulf `` Wulf '' Grimoire , introduced in `` Plum Spooky '' and his dark minion Hatchet .
Their rivals for the stones are Diesel 's dark cousin , Gerwulf `` Wulf '' Grimoire , introduced in `` Plum Spooky '' and his medieval-esque minion Hatchet .