Medigun

Team Fortress Medigun
It is a modified fire hose nozzle wrapped in black tape and outfitted with a bottom handle, which is connected to Ludwig's backpack by a hose. It fires a glowing colored beam into the recipient, who will then appear to exude similar colored cross symbols, similar to a Teleporter trail. When a disguised Spy is over-healed, enemies can also see the Red-colored crosses.

Despite technically being a weapon, the Medigun's chief purpose is healing injured allies and boosting the total health of the target up to 150%, also called overhealing or buffing. The Medigun's healing rate is variable, with a minimum rate of 25 HP per second in combat when healing players who have taken damage in the past 10 seconds. If the player being healed has not taken damage in the past 10 seconds, the Medigun heal rate will increase linearly with time up to a maximum of 75 HP per second healing for players who have not taken damage in the past 15 seconds (For example, a Teammate who has not taken damage in the past 12.5 seconds will heal at a rate of 50 HP per second). The maximum healing rate of 75 HP per second also applies to Animals.

As the Medic keeps his beam focused on a target, his Übercharge bar will gradually fill. The Übercharge meter will fill at a rate of 2.5% per second when healing injured targets (that is, not fully overhealed). The rate is halved when healing targets whose health is at 142.5% or higher. These factors stack, further reducing the charge rate. On maps with a pre-round timer, the Medigun's Übercharge rate is not penalized for healing targets and instead, increased to 3x of the normal rate which is already fully buffed as it would normally be during the round, but the pre-round charge rate is still reduced if the player is being healed by multiple sources.

When healing a patient with a faster movement speed than Ludwig, Ludwig's speed will be increased to match the patient, allowing him to keep up with Scouts, or teammates that have some form of increased movement speed. However, the Medigun cannot mirror blast jumps.

When the Übercharge is deployed, Ludwig's target will be encased in team-colored shells that render them invulnerable to damage (but not knock back) for 45 seconds. Disguised Spies that trick an Ludwig into Ubering them will also be invulnerable. While Übercharge is deployed, Ludwig and his patient will not be able to capture a point, push the cart, nor carry the intelligence.

The Medigun beam will stay locked onto its target as long as the wielding Ludwig keeps the primary fire button held down and stays within range. This allows Ludwig to turn around and effectively keep an eye out for incoming enemies from behind, and even heal allies from around corners.