Systems with gateways count as bordering for the purposes of diplomacy, so every opened gate increases diplomatic tension between all active gate-owners. Regular Empires cannot close their borders to Fallen Empires, meaning that their Gateways can always be accessed by the Fallen Empires, except when being at war with them. Gateways can't be used to travel to another Gateway if the latter is owned by an Empire that has closed their border to them. Upgrading it into a fully functional Gateway takes 5 years and costs 6000 energy and 2500 alloys. The construction site must be built outside the system gravity well and is built in 3 years and costs 100 influence and 2500 alloys. They can be constructed even in a system with an L-Gate or a wormhole. When a Gateway is reactivated for the first time in the galaxy, another random Gateway will also reactivate along with it.Д®mpires can build their own Gateways by researching the Gateway Construction technology, which requires the Empire to have encountered any pre-existing Gateways, so if Gateways were disabled during galaxy creation, it is impossible to build any new ones.Д®ach system can only have one Gateway. Reactivation of an abandoned gateway takes 2 years and costs 6000 energy and 2500 alloys.

Owning a system with an inactive Gateway drastically increases the chance for the Gateway Activation technology to appear, which is required to reactivate them. The number of abandoned gateways can be scaled by galaxy settings. While exploring the galaxy, empires can find abandoned gateways that were once part of a massive, galaxy-spanning network.

Stellaris apocalypse megastructures