- Available: Enter Clock Tower 5F for the first time
- Rewards: Almighty Badge (accessory), 7500 EXP
This is the final spatial void that Elizabeth has detected, which is at the bottom of Inaba Pride Exhibit. As with the other ones, there is a powerful Shadow guarding it, which is the Guardian Machine. This is a pretty easy fight, with one exception, making it a great place to grind for experience. First of all, the Guardian Machine is weak to ice and doesn't resist any other elements or physical attacks, so you're free to use whatever you want. That said, it does resist all of the ailments (nulls sleep) and binds, so having Impure Reach or Binding Hands will help to make any you want stick.
The boss can attack up to twice per turn and mainly uses physical attacks at the beginning of the battle. These attacks, Charge Shot and Spin Slash, can hurt a bit (especially the latter as it hits everyone), so weakening its strength is a bonus. It isn't until you see the message that "its eyes start shining" is when things can get hectic. When it does this, it will start using Mind Charge in tandem with Megidolaon, which can put quite a hurting on your party.
Landing Panic or Magic Bind on the boss makes it pretty harmless, especially if you can extend the duration of them with Stagnant Air. It'll allow your attacks to hit the boss as well, if you inflict the former, and even make it hit itself with regular attacks, helping to deplete its health. To help even more, you probably have access to your upgraded Personas, so using Debilitate with something like Sukunda will likely most of its attacks miss your members.