Adds a spidertron with 1 railgun instead of 4 missile launchers.
Why? The endgame railgun can easily kill demolishers, but you still have to manually travel to Vulcanus and run around. This mod lets you remotely claim new territory, the same way you do with a regular spidertron back on Nauvis.
This mod also makes railguns never damage any buildings/vehicles that you own. Otherwise the stupid spidertrons keep killing themselves and each other. Since your buildings are now immune, you can do slightly "cheaty" stuff like building multiple layers of railgun turrets on your spaceship.
See also: