HalluciGen, Inc.

HalluciGen, Inc. is a location in the Esplanade neighborhood of Boston in 2287.

Background
Before the Great War, HalluciGen, Incorporated was a biochemical manufacturer and innovator, aspiring to be the world leader in nonlethal technology for use by police and the military.

Recently, a contingent of Gunners came to the facility on the contract of a classified client to secure pre-War military technology, particularly the facility's "InvisiWave" and "Irradicator" weapons, as well as access to the facility's mainframe to download any available schematics. However, when they accessed the lab, a hallucinogenic chemical was released, causing the Gunners who came in contact with it to enter a murderous frenzy from catastrophic adrenal gland rupture. Those that survived the initial wave died fleeing the location, shot in the back by their frenzied brethren.

Layout
When the Sole Survivor first encounters the facility, the building is a mess of collapsed floors. The unlocked main entrance to the first floor is on the west side of the building, while the Master-locked basement entrance is to the north (with a tripwire triggering a makeshift bomb nearby outside). Several dead Gunners are found outside the main entrance, and more hostile Gunners are found battling each other throughout the interior.

The main entrance opens to a reception area. A hallway to the east contains a collapsed floor that leads down to the basement, which contains an employee locker room. A hole in the wall leads into the building's maintenance room before returning to the first floor via another collapsed floor. The subsequent hallway leads to a research office, which contains the Novice-locked research terminal and a weapons workbench. The hallway to the west passes an Advanced-locked room with an initially non-hostile Gunner (see Notes below), a grenade-trapped conference room, and a security room with the Advanced-locked security office terminal and two Protectrons in open pods. The hallway ends at a break room to the west, which contains stairs up to the second floor. The first room after ascending these stairs is the accounting office.

Past the accounting office is a descent to a maze of ruined test chambers (one containing the Novice-locked test chamber terminal) on the first floor. Three chambers are locked and may be opened with buttons on the outside walls, revealing hostile Gunners fighting each other. An unlocked room offers a return to the second floor and a balcony overlooking the partly glass-ceilinged test chambers.

After again climbing the nearby stairs to the third floor, an observation room on the left will greet the player character with an announcement inviting them to test some "products." Pressing the various buttons in the room will describe and activate various traps in the test rooms holding the Gunners downstairs. The Advanced-locked observation terminal in the room reveals that the rooms below were actually used to demonstrate HalluciGen products to VIPs, after which the rooms should be "cleared of test subjects, blood, fluids."

A stairwell to the south leads down to the basement, where the mainframe is kept. The second floor can first be visited from the stairwell to briefly climb back to the northern section of the third floor and the CEO's office, which contains the Expert-locked CEO's terminal and a Master-locked safe.

Returning to the basement via the stairwell and proceeding to the second room, the player can either hack the Expert-locked lab access terminal next to the locked eastern door, or use the Novice-locked mainframe access terminal in the adjacent room to the south. Beyond the locked door are the laboratories. To the south is a hallway filled with deadly gas, which can be removed by using the nearby Advanced-locked decontamination control terminal through the short maintenance corridor to the north to start the decontamination process. The gas-filled hallway leads into the lab proper through an unlocked door (though the lab may also be accessed through an Expert-locked door just past the decontamination terminal). The lab contains four chemistry stations and the unlocked development lab terminal. A broken wall on the north side of the lab leads to the back door exit to Boston.

Outside, behind the building is a garage with a green "Gun Shop" sign which contains a power armor station, a chemistry station, and a weapons workbench.

Main floors

 * Two Help wanted! notes – First floor, on the entrance reception desk.
 * Five drugged water cartons - First floor, in the entrance reception room. One is on the small table immediately to the right after entering the building from the main entrance, and four more are behind the reception desk.
 * Tesla Science Magazine – First floor, in the northeast corner of the building after ascending from the basement via a collapsed floor. This is the room with the research terminal controlling a HalluciGen Suppressor prototype device.
 * Note from Eric – Second floor, on a desk beside the accounting terminal.
 * Two drugged water cartons - First floor, in the test chambers' Novice-locked locker room, down the hallway from the rooms opened with external buttons in which the Gunners are trapped.

Basement

 * Day Tripper - In the toilet tank after passing through the locker/shower room near the building's main entrance.
 * HalluciGen master password – Obtained from the mainframe access terminal. Gives access to the research terminal, CEO's terminal, lab access terminal, and decontamination control terminal.
 * Nine HalluciGen gas canisters – All in the lab with the Gunner commander. One unit is needed for the miscellaneous quest Hazardous Material given by Fred Allen in Goodneighbor, and only appears if that quest is active.
 * Fourteen ruptured HalluciGen gas canisters – All in the lab with the Gunner commander.
 * Nuka-Cola Quantum – In the lab with the Gunner commander.
 * Stealth Boy – In an open safe in the lab with the Gunner commander.
 * HalluciGen mission brief and Gunner's note – On the Gunner commander.
 * HalluciGen key – On the Gunner commander; another copy is in a steamer trunk near the north exit.

Appearances
HalluciGen, Inc. appears in Fallout 4 and is mentioned on Frederick Rivers' terminal in Fallout 76.

Behind the scenes
Brent Spiner stated on Twitter that he may have voiced the HalluciGen mainframe heard in the building, but is not credited for the role.