Room Zero

""I've been in there," he explained, "There's nothing but a cement floor and four walls."

"No," Ida shook her head and covered her mouth, stifling a sob, "You've been on top of it.""

- Room Zero

Room Zero refers to an underground bomb shelter located in Disney World.

An unnamed incident which occurred at this shelter during an air attack led to a new form of Corruptus and the Gascots (which may be one and the same).

Only the protagonist and Hammer know about it. Ida witnessed the incident taking place in Room Zero while she was still alive.

Gascots
Gascots are entities seen by humans as variously aged and gendered figures with Disney gas masks.

Hammer has witnessed Gascots up close. Hammer describes the Gascots as "mov[ing] weird [...] [as if] they were weak or injured." He also noted that the Gascots' masks "seemed wet on the inside".

Not much else is known about the Gascots, but their relation to Room Zero is clear, and their appearance is at the very least humanoid.

Hammer
"Hammer worked around the Disney World park, doing demolition and construction. At one point, he approached a superior regarding some strange construction plans."

- Room Zero

Hammer is or was one of the constructors of Disney World. He had witnessed Gascots up close before and was once told about Room Zero by Ida, making him a viable target for Disney; because of this, it is unknown if he is being pursued by Disney, where he lives, or if he is still alive.

Ida
"&#91;Hammer&#93; hit dead ends throughout, until he was directed to Ida, an elderly woman who worked in a restaurant on Main Street. She'd been there since way back, and though nobody had the balls to ask directly, everyone KNEW she had plenty of terrible stories to tell."

- Room Zero

Ida was a worker at a restaurant on "Main Street" (supposedly close to Disney World). It is possible that Ida worked at Disney World as well. She is one of the few that left Room Zero during the incident that occurred there.

Ida died shortly after explaining Room Zero to Hammer. It is implied that the company covered it up in the press.

Not much else is known about her.