"Mmmm, sure! I see no reason since you have come thus far."
Suddenly, above the Lizard and Phantom a holographic blue image of the Apocalypse Cannon appears! It is far larger than the hologram shown in Grandma's place-
"Here is my beloved cannon, beautiful isn't it? The size of a small city inside, the corridors brimming with defense systems rivaling the outside. The Savior managed to bring his entourage, consisting of Voidborn both reanimated and voidtech-imbued. Any single one of them would outmatch your world's standard warrior, and theoritically this Voidborn clad in dark nether armor intends to start up something..."
The hologram zooms in on the large crystal laser itself at the end, and within is a chamber that looks similar to a throne, above it a control center?
"The main control room for the cannon, the 'brain' of it all if I had to put it into words. Here, the cannon converts Pure Nether and Void into a powerful beam, one as you have experienced capable of easily wiping away a city."
It zooms in more towards the center, on a specific console-
"And here is the head console, see that interesting looking reader that looks like a key can slide into it? That is the 'dismantle' switch. I am not foolish enough to have a self-destruct switch, lest the resulting explosion could tear apart the fabric of space, time and dimension! No, rather if a certain key were 'inserted' here...the cannon would begin to as the name suggests, disarm, and dismantle itself into harmless and eventually useless components that will fade into the Nether..."
Phantom sees an emerald flash near the Professor, a weird card is held in one of its tentacles-
"Oh? What is this? How did this key get in my grasp? Yes! This is the 'dismantle' key! What's more, it is no different than a normal identification card for 'friendly' by the Apocalypse Cannon. The party holding this key can near the cannon without being shot at from the outside!"
The Lizard eyes the key specifically...then realizes something-
'Wait, something is wrong, this guy is telling us an awful lot for guests, I don't care how insane he is...this feels wrong...'