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.
Skills that prevent burning, such as Frigid Armor, or Avatar of Melandru, can make surviving an encounter with Borrguus much less stressful.
Bug! Blisterbark and his Burning Spirits use the same quotes Charr do during battle, such as "Make peace with your gods, meat!"