Abyss

Abyss is an underground area in Fire Emblem: Three Houses and primarily appears in the Cindered Shadow DLC side story.

Profile
Deep underground below Garreg Mach Monastery lies a series of secret tunnels that lead to an entire underground town known simply as Abyss. It is her lie various vagabonds who find solace in the depths. Many who live her have been assumed dead or missing and live quietly, though under the watch of the Church of Seiros who are the only people who directly know of their existence. One Cardinal of the Church, Aelfric, serves as a bridge between the Abyss and the world above and desire to help them as best as he can.

Among its denizens are several Academy age individuals. By Aelfric's insistence, a fourth house, the Ashen Wolves, reside, though they are not formally known by the Academy staff.