Borrguus Blisterbark is an Elementalist boss that can be found in Sacnoth Valley.
- 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.
- Fighting him while riding a Siege Devourer (From Dalada Uplands) makes this fight significantly easier.
- As with Korshek the Immolated, all of his skills are from the same attribute line, so one hero with Power Block shuts him down completely.