Reactor

Basic Information
The reactor (RC) is the most important human structure. It supplies power to all the buildings and is absolutely required to build anything at all. If the reactor goes down, all other buildings except telenodes will refuse to function.

Reactor placement strategy
Good reactor placement can make the difference between a doomed team and a winning team. The reactor's placement should try meet the following criteria: Some maps offer better base areas than others, it is important to assess which areas would make for a good base. When moving the reactor it is absolutely vital you move at a good time, ideally waiting for stage 2, and always warning your team prior to deconstruction.
 * In a corner, cul-de-sac, or area with a low roof. This forces aliens to attack from just one or two sides, limits sniping opportunities, and makes RC hopping more difficult.
 * In or very close to the main base. This makes it much easier to defend when moving.
 * Surrounded or leading to an open area or long hallway. This makes approaching aliens very easy to attack and means they will be very weak by the time they reach your base.

Reactor defence strategy
The reactor should always be surrounded by a dense clump of turrets and/or teslas as well as the bulk of the team's spawns and medistations. It is also important to have an armoury nearby.

It's tempting to put the reactor in some forgotten corner or vent somewhere with a pair of turrets, but just remember that any aliens who find it will have no trouble executing hit-and-run or snipe attacks. Unguarded, the reactor becomes a liability (as its loss will cripple the team).

The reactor is capable of defending itself with a high-intensity electrical zap dealing 40 damage at the centre, however it only happens once a second and is drastically weakened when aliens are on the top dealing only 2 damage. A Marauder and even Basilisk that hops on top will have plenty of time to destroy it. This makes anti hop turrets and RC locations key targets for the team builder.

Reactor counter strategy
Prior to Stage 3 the most effective way to destroy the reactor is to hop on top of it and continuously attack it. During the early stages Humans are often eager to move their reactor to a more desirable spot. Waiting for this prime opportunity to rush and attack is also a successful method of closing out the game. At Stage 3, multiple Advanced Dragoons can snipe repeatedly at the reactor to bring it down very quickly.

Game mode and QVM Variation differences
Tremulous 1.2 GPP
 * no longer gives frags
 * fixed a bug that made the defensive zap deal more damage when multiple targets were in range