The Tower (also known as the Ark) is a large white machine made spire with shattered block-like support structures spread across the various Zones. It bears significant resemblance to the Copied City in terms of design. It is the final destination players will encounter in NieR: Automata and is available to both A2 and 9S.
The entrance to the Tower is located within the crater, left behind after the Goliath attack that took place within the City Ruins.It must first be unlocked via hacking the sub-nodes a short distance away from the entrance. To do this requires 3 Access Release Keys which can be obtained after destroying each of the Resource Recovery Units.
|Tower Entrance - Access to the tower requires 3 nodes to be unlocked. Any intruder is greeted by a horde of machines. Devola and Popola assist 9S when attempting to enter, however they are killed in the battle. Upon going inside, the player recives the Devola & Popla's Memories novel.|
|Sub Nodes - Each node must be unlocked using its respective key. Forest Access Key, Ocean Access Key and Park Access Key. They can be acquired from the Resource Recovery Units.|
|Shattered Staircase - The only way to advance up the tower, this strange staircase is guarded by corrupted YoRHa Units.|
|Ambush - Upon entering, 9S falls through a cracked floor tile and is promptly attaked by 2B Copy's.|
|Hidden Chest - After eliminating the virus, 9S can hack a hidden chest behind the fallen debris, containing the archive Project Gestalt Report 11.|
|Red Girls - Reaching another floor reveals another trap, laid out by a copy of the Red Girls. After defeating the wave of machines the player is rewarded with (Top Secret) YoRHa Disposal|
|Flight Unit - A squadron of corrupt YoRHa Flight Units engage 9S. After disposing of them he pilots one himself to continue the climb toward the peak.|
|Elevator - After A2 rids herself of the hacker threat, she begins to ride the elevator to the top of the tower, fending off the Goliath-class machine Ko-Shi.|
|Battle for the Sky - Using the flight unit, 9S takes on the Goliath-class machine Ro-Shi.|
|Summit - Both androids reach their destination and reluctantly work together to defeat the Goliath-class machine lifeform Ko-Shi & Ro-Shi. During this fight the player perspective constantly shifts, getting more frequent as the machine loses health.|
|Peak - The threat eliminated, the androids once again confront each other at the top of the tower. The player makes a decision as to which character to control, and recives a different ending based on this.|