Tartarus

Appearances

 * Persona 3
 * Persona 3 Manga

Location information
Tartarus is a massive tower that appears each night during the Dark Hour in Persona 3. Because it "grows" out of the ground each night, the layout of the tower is assembled randomly, aside from certain key floors that never change. The tower is a sign that Nyx has been called upon and it's entire existence is in order to provide a bridge for Nyx's inevitable arrival. The tower first appears in 1999, when Mitsuru Kirijo's grandfather attempts to summon Nyx and bring about The Fall. S.E.E.S. is formed years later in an attempt to discover the nature of the tower. This location is the only place that the player fights shadows, with the only exceptions being the Full Moon Operations.

Blocks
Tartarus is divided into multiple "blocks", each of which has it's own unique architecture.
 * Thebel Block: Floors 2-16
 * Arqa Block: Floors 17-64
 * Yabbashah Block: Floors 65-114
 * Tziah Block: Floors 115-164
 * Harabah Block: Floors 165-214
 * Adamah Block : Floors 215-263
 * Monad Depths : An extra "basement" block which consists of 10 floors.