Light Barriers

Light Barriers are planetary shields at a more advanced level, shielding a entire solar system while the standard planetary shields individually shield planets and moons, both working separately at the same time. As FTL Travel can get someone from the edge of the galaxy to the complete opposite side in a few seconds or even less, it has been utilized in war for easy access to major worlds, so light barriers have been made to protect key systems. Upon impact the starship and/or attack would be damaged or even erased from reality as per the usage of Dark Energy, and as even going FTL cannot pass through a planet that is protected by the standard planetary shields, the same applies to the light barriers. The output of the light barriers are extremely high, ranging early into the octillions of tons per second range, and not even planet-sized objects can go through. All major star systems have light barriers now, especially ones with planets such as Valinor, though backwater star systems are very lacking in light barriers, and tend to just have the standard model of planetary shielding.

In addition, light barriers can detect if a enemy or attacking starship has entered the star system they protect and shoot out a planet-sized tractor beam to trap them, then alert a fleet to handle the rest.

Countermeasures
The only way to pass through a light barrier is to use Eneramp to teleport past the light barriers and into the star system they protect, or some other means of teleportation, and the one starship that has ever broken a light barrier by itself is The Xezilihis Superweapon using it's main cannon, which also destroys the solar system upon impact with a light barrier.