In the teachings and theology of the Islamic people, the Zaqqum (or "Zaccoum") is a demonic and foul fruit-bearing tree that grows in the depths of Jahannam, the Islamic name for the underworld (Hell). It is mentioned in the Qu'ran that the souls that dwell within Jahannam are compelled to eat the bitter fruit that grows from it, but it only serves to intensify their torment. It is one of only two things that the Khati'un, a group of sinners who never believed in Allah or helped the needy, are allowed to eat. It is either the fruit of Zaccoum or Ghislin, the foul pus that comes from washing their wounds. The fruit itself is said to be shaped like the heads of devils, and once ingested will churn in the stomachs of the sinners like boiling oil causing them immense agony.
Zaccoum can be found within the Tennozu Shelter. It can teach the Poison Breath, Acid Breath and Pandemic Bomb skills through its Demon Whisper. Zaccoum benefits from learning ailment, Ice and support skills.