From ImperialWiki

The Sun Crusher was a fighter-sized craft covered in quantum-crystalline armor created at the Maw institute. It was equipped with a resonance torpedo launcher that could cause a chain reaction in stars, inciting a supernova.

The ship was eventually destroyed after being piloted into a black hole by Kyp Durron. Questions like how it landed and what you would do if you forgot where you parked it were never answered.

[edit] SDN Reaction

The Sun Crusher is universally hated and derided as KJA wank, especially the near-invincible-armor aspect of it.