Hidden Depths is a Quest in Pillars of Eternity 2: Deadfire.
- Speak with Llengrath inside the Hall of unseen.
- Follow Llengrath
- This quest is acquired when you sailing on the sea. (the chance of this random encounter is not very high so you may need to sail for some time.)
- Travel to Hall of the Unseen (see Locations if you dont know where it is), in the centre chamber, you will meet Llengrath again, follow her to the lower level.