Hell Fiend

"A handsome, younger man stood beside the Berserker with an unruly temperament. The young man carried a staff made of sapphire crystal and wore a set of gray mage robes. Faint arcs of gray electricity surrounded his body." - Chapter 822

When Hell Fiend heard about Zero Wing preparing to purchase the lands in Snow Field City from Sinned Heart, he was enraged that King's Return's warning had been ignored and sought to destroy the guild. After the team that was to eliminate the Zero Wing elites was defeated, Hell Fiend threatened to use the Ancient Abyssal Book to open an Abyss Passage to destroy Stone Forest Town. Shi Feng however still refused to concede. Instead of opening the Abyss Passage to Stone Forest Town however, Hell Flame actually used it at Snow Field City. Shortly afterwards, Shi Feng anonymously killed Hell Fiend while he was hosting a recruitment competition for King's Return, obtaining the Ancient Abyssal Book after his death.