Confronting Tranzig is an important quest in Chapter Three of Baldur's Gate and Baldur's Gate: Enhanced Edition. This quest may first appear in your journal when you read the letters carried by Mulahey (although this event does not always trigger for unknown reasons): 
Confronting Tranzig

From Mulahey's letters I see that he had a superior named Tazok to whom he communicated through an intermediary named Tranzig. I should be able to find this Tranzig at Feldepost's Inn in Beregost.

A journal entry may also result from rumors gathered in Beregost

Confronting Tranzig

A strange man named Tranzig makes frequent midnight trips out of Beregost. An odd occurrence when so many cannot travel safely even during the day.

Even if there you have no journal entry for this quest, you will be led to it by the Important Events: Tranzig journal entry, and it will show up in your journal as a completed quest.

When you meet with Tranzig in his room at Feldepost's Inn in Beregost, two outcomes are possible:

  • If you force a confession from him, the quest closes with this journal entry:
Confronting Tranzig

Once he saw things my way, Tranzig confessed that he was a messenger for the bandits, delivering letters between one Tazok and the late, unlamented Mulahey.

  • If you kill him without first getting his confession, the quest closes with this:
Confronting Tranzig

Tranzig and I had it out at Feldepost's Inn in Beregost. Looking through Mulahey's letters, I see he was in cahoots with the bandits. He probably knows where they make their camp.

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