The event in motion
Lair of the Lacuni is an event in Act II of Diablo III. The event starts as soon as a player enters the Abandoned Mineworks . You're tasked to save the ambushed Iron Wolves in the cave. There are 3 groups that need to be saved. After saving them, you are asked to talk to the capain, who thanks you for the help. Shortly afterwards, you are ambushed yourself by a large group of Lacuni Huntresses and Ghas. The event ends after Ghas's defeat, with gold and experience as a reward, along with the achievement "Lair of the Lacuni".