In life, these faceless legionnaires of the Nine Hells were soldiers who served evil without reservation. In death, they serve Raphael.
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— In-game racial description
Vengeful Merregon are a type of Fiend in Baldur's Gate 3. Merregon are footsoldiers that serve in the Nine Hells. Vengeful Merregons can be encountered in the House of Hope.
Vengeful Merregons can be encountered after raising the alarm in the House of Hope. Raphael's Eternal Debtors can turn into Vengeful Merregons upon death or when using Forever Indebted, though they may turn into Vengeful Boars or Vengeful Imps instead.
Combat
One of the Vengeful Merregon's most dangerous abilities is their Flames of Avernus passive which applies Fire vulnerability with their attacks. Most of the other enemies fought alongside Vengeful Merregons can deal substantial fire damage which will be doubled by this effect.