Arsenals radiate lines of communication. They are immobile and have no defense
but can be occupied by friendly units. Occupation by the enemy means the arsenal
is destroyed, and the elimination of both arsenals means the game is
won.
All units must remain in direct connection with their own lines of
communication, or be adjacent to a friendly unit in communication. If not, the
unit goes offline and becomes inert. Units are free to move
out of
communicative range, but once offline they may not move, attack, or defend
themselves. (However any nearby friendly units will still lend their defense to
offline units.) Relay units are an exception: they may move freely in and out of
communication, yet will only relay the arsenal's signal if in direct line of
sight.
Lines of communication are blocked by mountains and by enemy units. However
communication passes freely through mountain passes and is not blocked by enemy
relays.
Relays have a defense of 1 and cannot attack. They move 1 square per
turn.
Swift relays are identical to normal relays, except that they can move 2
squares per turn.