Confronting Tranzig

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): 
A journal entry may also result from rumors gathered in Beregost: 
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: 
* If you kill him without first getting his confession, the quest closes with this: