Tier 1: Follow The Blood Trail
The cave entrance you are looking for is at coordinates (617, 338). When you arrive, kill 10 Cultists while making your way through the cave.
Tier 2: Kill Theroxis
When you kill Theroxis, there is a side quest directly behind her. The Broken Sword gives the quest “She Who Likes Silence“, a guide for which can be found here.
See our complete list of guides, solutions and walkthroughs by clicking here.