Breaking Some Eggs
This Quest is given to you upon discovering your first Glyph within one of the three Rhoa Nest (appearing as a bright green dot on your map) located within the Mud Flats (entrance located in Terraces).
Once you have collected all three Glyphs proceed to the Strange Glyph Wall which will open up the way for you to progress to Lower Submerged Passage.
Talk to Tarkleigh in the Lioneye's Watch to claim your reward.