Tesla Cannon (Fallout 3)

The Tesla Cannon is a shoulder-mounted, recoilless energy weapon that fires powerful blasts of electricity. It is powered by Electron Charge Packs. It is likely based on designs confiscated by the US Government after the death of Nikola Tesla.

The quest line of Broken Steel includes having to find a Tesla Coil for this weapon in order to help the Brotherhood of Steel build it.

Locations
There are a total of 13 Tesla Cannons, or 14 if you count the Beta Tesla Cannon, but only a maximum of 11 (12 with Beta Tesla Cannon) can be obtained in one play-through.


 * The first Tesla Cannon can be acquired upon your initial arrival at Adams Air Force Base. There will be a resupply crate directly to your left near the wall upon exiting the Presidential Metro.


 * Once you leave Adams Air Force Base, if you did not blow up the Citadel and return there, 2 Tesla Cannons can be found in the Citadel Lab after finishing the quest Who Dares Wins, on a table in front of Liberty Prime's docking bay.


 * If you blew up the Citadel, you can find 2 Tesla Cannons in the Citadel armory. If you did not blow up the Citadel you can't get into the armory.


 * If you return to Adams Air Force Base after Who Dares Wins, you can acquire 8 more Tesla Cannons (4 in perfect condition, 4 in poor condition).
 * The first pair are before you reach the hangars. Traveling northeast from the Adams Air Force Base Entrance towards the hangars, the 4th open-topped military truck in your path has a resupply crate in the back with a good and poor condition weapon and EC Packs.
 * The second pair of cannons (along with some EC packs) is in a resupply crate between the first and second hangar on the way toward the Mobile Base Crawler by the base of an Enclave barricade. To be clear, these two hangars are to your right once you reach the airfield portion of your base, near 2 parked Vertibirds.
 * The third pair are in a resupply crate by the ramp leading to the covered catwalk between the second and third hangar on the way to the Mobile Base Crawler.
 * The fourth pair are at the base of an Enclave barricade, between the Mobile Base Crawler and the Air Control Tower.
 * There is another Tesla Cannon that can be found outside of the map during the Death From Above quest. It is similar in appearance to the Missile Launcher and is a beta version of the Tesla Cannon. It is not considered to be a unique weapon because it was originally cut from the game.

Appearances
was added to Fallout 3 in the Broken Steel add-on. It was going to appear in Fallout: Brotherhood of Steel 2, which was cancelled by Interplay.

Bugs

 * If you kill an enemy with the splash damage effect alone, you may not earn XP for the kill, but you can use this to your advantage. If a good character is killed by the shock damage after effects it will result in no karma loss or hostility from nearby NPC's. You will also not receive any fingers or ears for enemies killed by the Cannon's splash damage.
 * Star Paladin Cross may sometimes automatically equip the Tesla Cannon, even if the player does not set it into her inventory and if the player does not have it in theirs.


 * It is possible to get unlimited numbers of the Tesla Cannons. Directly west of the Enclave Crawler ramp is a hangar with a partially collapsed roof, with a blue force field butting against its southern side. If you stand on the west side of the forcefield, through the forcefield you will see a battle that goes on with 2 respawning Enclave soldiers and 3 Brotherhood of Steel soldiers on the runway. These soldiers constantly respawn with random weapons, one of which is occasionally a Tesla Cannon, although this is not common. When the player sees the distinctive beam fire of this weapon, they need to run through the semi-collapsed hangar, onto the airfield, and wait for the NPC to die. The bodies of dead NPCs vanish after 10 seconds, so the player needs to be quite quick.


 * In some cases the gun becomes invisible and doesn't deal damage in third person and in V.A.T.S. One case the blast from the Tesla Cannon seemed to hit extremely far to the left. The cannon also uses ammo when this bug happens.


 * While wearing T51-b power armor it will appear as though the left shoulder pad is coming off. Only when it is mounted on the shoulder.
 * Also in some cases the gun will disappear from your hand and reappear on the floor, only in third person. It will not follow the direction of your crosshair but the direction it is facing on the floor.
 * People may notice that the Tesla Cannon will not take down a VB-02 Vertibird in a single shot, unlike the console versions of the game.
 * Tesla Cannons can be bought before the player has actually gathered the Tesla Coil, and created the first one. Several random encounter traders have been known to carry these as long as Broken Steel is loaded.

Behind the scenes

 * The Tesla Cannon was also to be featured in the canceled Fallout: Brotherhood of Steel 2, bearing a striking resemblance to the weapon in Broken Steel. Described as a "high-powered mass-cannon throwing tessellated plasma forward in an orgy of death and destruction" in the FO:BOS2 design document, it was to be the so-called "uber-weapon" of player character Maxus. "Uber-weapons" were to be unique weapons for each PC which had to be assembled from 5 parts over the course of the game. One of the five parts for this weapon was a Tesla Coil.
 * Nikola Tesla really did try to create a directed energy weapon but it would have been a Particle Beam Weapon called a "Teleforce", something that would be immensely complicated to create (laser weapons would be easy by comparison) and is a type of weapon that is not even mentioned in Fallout 3 (possibly the entire series). Simply put, a particle weapon accelerates atoms or electrons at extremely high velocity (at relativistic speeds) to damage a target.