Satellite D13

''If you don't take out that satellite, the battle for Nalfaria will be hopeless! Don't fail us now, Electra!'' -SRF Commander

D13 is a massive satellite constructed by Megacorp. It orbits the planet Nalfaria and acts as its main air defense.

Characteristics
D13 is huge, almost nearing the size of an entire planet. The satellite is shaped like a ball and is constructed entirely of a sturdy metal. Its thick outer shell is covered with a myriad of automated laser cannons, including one massive one almost powerful enough to eliminate an entire planet in a single shot.

Inside D13 is a system of tunnels that all connect to the satellite's core. The core is a large fusion reactor that is speculated to be powered by Hounouran or its mysterious polar opposite.

D13 was created by Megacorp and orbits Nalfaria.

The Clandestine Construction
It is hinted by the SRF Commander, as well as several Megacorp lackeys, that a secret construction operation was taking place at Nalfaria, and, if completed, could render Megacorp invincible. No one, however, ever found out exactly what it was.

It was not until Act 5, when Inara was confronted at Rosaplen, that D13 was first mentioned by name. Before Inara flees from Rosaplen, she mentions that "[the SRF] may have trumped me, but you won't stand a chance once D13 is completed!" Even still, exactly what D13 is is still not mentioned.

At the end of Act 8, when the SRF approaches Nalfaria aboard the SRF flagship Luxio Gamma, D13 is first seen. Nes then delivers his memorable quote: "Holy Hindenburg... what the heck is that thing!" to which Holly replies "That's what Megacorp had been up to."

D13's Last Hurrah
At the beginning of Act 9, the second-to last act in the game, the Skaylian Resistance Force finally reaches Nalfaria. However, before they could attack the planet, the SRF was forced to take down D13. In order to do so, they were forced to approach the satellite, dodging gunfire and enemy spacecraft.

After they were able to take out D13's command post, the SRF intruded the satellite, eventually reaching the core. They destroyed the core and were barely able to escape before the satellite was destroyed.

With the D13 satellite gone, the SRF was able to go for Nalfaria.

Trivia
It is widely believed that D13 may have been inspired by the famous Death Star of the Star Wars series. It is similar in both appearance, function, and the way it was destroyed. The way the SRF singlehandedly dismantled the entire Megacorp defense force is highly reminiscent of Star Wars's climatic battle at Endor.