The Sun Crusher was one of the most powerful superweapons ever devised. It was developed at the secret Maw Installation.
It was a nearly indestructible craft that was no larger than a starfighter, but was capable of unleashing destruction on a magnitude that dwarfed even the Death Star's capabilities. Unlike the Death Star, which destroyed individual planets, the Sun Crusher could destroy an entire star system by causing its target star to turn into a supernova. The key to its near invincibility was layered Quantum-crystalline armor, a material so strong that it could perfectly repel even turbolaser shots. Han Solo

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once was able to ram the Sun Crusher straight through the bridge of the Imperial-class Star Destroyer

Imperial-class Star Destroyer Starship Starship Models

Hydra without taking any damage, and during the skirmish in the Maw, it even survived a glancing blow from the Death Star prototype's Superlaser, which likely would have destroyed any other ship it touched. The Sun Crusher took some damage to the engines, but was able to continue to fight. The Sun Crusher was also equipped with a hyperdrive and was designed to slip unnoticed into a system, fire its weaponry, and then escape before its presence was detected.
The Sun Crusher's primary weapon was a payload of 11 energy resonance torpedoes. Each torpedo resembled an oval-shaped plasma discharge and was activated when it passed through the Sun Crusher's resonance torpedo launcher. The resonance torpedo then traveled to the system's sun at near-lightspeed velocity.
Upon impact, the torpedo burrowed into the star's core, releasing dense packets of energy that rendered the star's core unstable, initiating a chain-reaction that forced even low-mass stars to go supernova. The star would be ripped apart in the explosion, sending waves of energy and radiation out across the system that destroyed every planet and all life in its path. The Sun Crusher could obliterate an entire system in mere hours. Once launched into the star, it was impossible to stop the impending supernova. The resonance torpedoes could also be launched at any starship, instantly destroying it.