Borrguus Blisterbark is one of the bosses included in the Brand the Boss 2007 contest. It was named by Moses Fiellau-Nikolajsen of Denmark.
His Searing Flames can easily wipe your entire party, since he travels with four other Burning Spirits that cast the same spell. Having Protective Spirit active is a near-must, since their damage can reach up to 600 damage on multiple characters.
He and his large group of Spirits roam fairly fast around the burning forests in the south-eastern part of the map. Be wary of not aggroing his group while fighting other mobs as this result in an almost certain wipe.