Depending on the house Byleth has chosen, Edelgard/Dimitri/Claude will request for them to investigate stories about Abyss.
"Wanted: Any and all information regarding "Abyss"."
"Investigate the stories about Abyss. Maybe the traveling merchants who come along know something about the place..."
Quest-Giver Dialogue 
"I've been hearing a lot about a place called Abyss lately. The name is unsettling, but I don't really know anything about it... If you have time, could you look into it for me?"
"Hey, Professor! Have you heard of...Abyss? I don't know what it is, but ever since I heard the name. I've been curious about it! If you don't mind, could you do a little investigating?"
Quest Completion Dialogue
"Abyss... A dangerous area below Garreg Mach that folks tend to avoid... I can't believe such a place has existed right under our noses! I wonder how much the archbishop knows about this."
"Abyss...A dangerous area below Garreg Mach that folks tend to avoid... I can't believe such a place has existed right under our noses! This might have an effect on public order beyond Garreg Mach too."
Given to you by the leader of the house Byleth has chosen in various locations on 1F.
- 700 Renown
Subjective: The following part of this article is based upon the editor's personal experiences and opinions, and therefore may not be applicable for all readers.
Talk to Anna and retrieve "Abyss Information" (Informaton about the Abyss from Anna. It seems to be a dangerous place that regular folks tend to avoid).
- This quest served as foreshadowing towards the Cindered Shadows DLC sidestory, marking the first time Abyss was mentioned.