The Terminus mine is a mine that halts the advance of fleets and funnels them into particular firing lanes. They limit the movement of attacking fleets. It was released on December 18th, 2013. Their manner of fire is by emitting radiation, and they can't be targeted or destroyed. As an attacker gets closer to the mine it will light up in warning before it detonates. These mines can be seen on the combat screen along with the warning and blast radius. However, squadrons launched by carriers are not affected by Terminus Mines, but they will activate the warning effect.
Mines do not need to be repaired or rebuilt. They have no health points, it is impossible to destroy them.