Ain't no way we can break through these defenses.

Looks like the Ancients set up these beacons to protect their border.
Every time we set foot behind the line, someone gets zapped, fried, or pulverized. Lord Vorgoth won't like this at all...

If we want to cross the threshold to their territory, we'll have to tear down some beacons... or find a way to deactivate them. If we're victorious... no, when we're victorious, then the ancient gates will be right at our fingertips.

Office of Lieutenant Arlington, First Overseer of the Expansion Program