Reiss Chapel

The Reiss Chapel was a church owned by the Reiss family. On the surface, it appeared to be a regular church that the Reiss family frequently prayed in, but below the surface it served as the site where all the Reiss succession rituals took place.

Description
The Reiss chapel was a small church within Wall Sina on the Reiss family estate. Above ground it looked and functioned like any other church. Below the alter was a stairway that led to a large underground cavern, created by the First King, containing hardened crystal walls that seemed to faintly glow. Due to the characteristics of the walls, Rod and Historia Reiss were able to jog Eren's repressed memories of Grisha's attack on the Reiss family.

History
The cavern below the chapel was created over 100 years ago by the First King. Some time afterwards the Reiss Chapel was built above it. The chapel has been destroyed twice; the first happening during Grisha Yeager's attack on the Reiss family, the second was after Rod Reiss became an extremely large abnormal Titan, thus splitting the ground above him due to his size.