The way to trigger the investigation Hakkar mission in Baldur's Gate 3 is that it can be triggered before the three goblin bosses are killed. Players must first find the letter in the current box and get the information inside to trigger the mission.
Answer: It can be triggered as long as the three goblin bosses are killed.
The first is the room where the player stays according to Kahal. There are two doors, one of which can see Nettie.
There is also a box behind the bookshelf. There is a wolf patrolling in the room.
After opening the box, you will learn that the Shadow Druid wants Kahal to meet in the swamp alone.
Finally, go to the swamp to find evidence in the twisted tree. Then you can trigger this mission.
