Now that you have reached the hideout, you will have to jump down a mine shaft in order to access the entrance. As you enter the cave, look south to find a small crack in the wall, from which you will be able to find a room filled with loot. After that, progress further into the cave and defeat any cultist guards that you come across. There should only be one along the tunnels inward. When you reach the area where Lagos’ family are being held, you will find three guards sleeping on the ground. Kill them with stealth attacks and then free the family from the cages. Speak with Lagos’ wife to initiate a dialogue. After persuading them to find Brasidas and stay with him until further notice, the quest will complete and you can leave the cave the way you entered.