Nihilus is a particularly cryptic and powerful Sith, and I would like to portray what few showings he does have here.

As with other EU respect threads, however, this will be different in that comics are not the only source material for Star Wars. To represent Nihilus' capabilities, I will be posting plenty of comic scans but also presenting videos from Knights of the Old Republic II: The Sith Lords as well as quoting sourcebooks. For those of you who are hazy on Star Wars knowledge, let me explain a few things first.
1. Just in case this needs to be said, EU is Expanded Universe. Basically, EU Star Wars is all information and material separate from the movies. This includes TV shows, comics, novels, video games, etc.
2. The Star Wars canon classes will be brought up in this thread at least a few times. So, to follow the terms I use and just to clarify, in Star Wars continuity, there are five canon classes.

• G-Canon- (George Lucas Canon). This is the highest canon class. It includes only the movies and material pertaining to them.
  
• T-Canon- (Television Canon). This is the second highest canon class and includes any information provided in TV shows. This includes Star Wars The Clone Wars, as an example.
  
• C-Canon- (Continuity Canon). This is the basic canon. This includes everything else that is confirmed to be in continuity, i.e., novels, comics, sourcebooks/handbooks, video games, etc.
  
• S-Canon- (Secondary Canon). This is essentially any information that has yet to be confirmed as canon. It should only be mentioned in the context that there is a chance a given piece of information could be non-canon.
  
• N-Canon- (Non Canon). Self-explanatory.

Visas: His power is great, and it comes from hunger. He is a wound in the Force, more presence than flesh, and in his wake, life dies... sacrificing itself to his hunger.

Darth Traya indeed teaches the newly christened Darth Nihilus to harness his life-draining gift to radical heights—so effectively, in fact, that Nihilus saps Traya's powers in a calculated double-cross.

But Traya underestimates her disciples' depravity. They turn on her and drain her Force powers.

Nothing matters except his hunger. Before it devours him totally, Nihilus uses its power to displace his persona into his robes and armor. As his useless body disintegrates, he becomes living primitive intention; at last, the whole of the galaxy becomes food—for Nihilus has become the hunger.

Then, when all seems lost, he discovers that his emptiness hungered. The first time, he fed it unconsciously. Draining another being's life is frightening, nauseating, but for a euphoric moment, the memories, the illness, and the hunger disappeared. But it proves insatiable. The more he indulges it, the shorter the satisfaction lasts and the more severe the hunger becomes. He begins feeding relentlessly, still always craving. Existence again becomes unbearable, but then hope materializes. A blind Sith Lord appears. She has felt his existence like a gaping wound through the Force. The Force, she explains, fuels his hunger, and she will show him how to devours worlds. The Sith and the Force are meaningless to him, but the hunger must be appeased.

However, Traya reciprocates his betrayal by luring him into a confrontation with the Jedi Exile and Nihilus's own former apprentice. When Nihilus tries feeding on the Jedi, his hunger is mysteriously repelled, as if confronted by his exact polar opposite. Psychically starved by the effort, the Dark Lord falls to the Jedi, and Nihilus the man dissolves into oblivion.

Although Darth Nihilus managed to stun the Exile, he was unprepared for the devotion of his former pupil Marr to the young woman. Marr tried to exchange her life for that of the Exile, giving the former Jedi time to recover. Together, they confronted Darth Nihilus. The Sith Lord was no match for their combined might, and he fell in battle.

Colonel Tobin: This ship... is it his weakness? It should not exist, yet it cruises the darkness between the stars. He tore it from the mass shadows of Malachor, along with his fleet... that is a measure of his power.
Canderous: Hnh. This ship is barely holding itself together. The structural damage should have destroyed it long ago.
Colonel Tobin: He holds it together.

Most Centurion-class battlecruisers are destroyed or captured by the end of the Jedi Civil War. However, during the Dark Wars, the Sith Lord Darth Nihilus managed to resurrect one of the crushed battlecruisers from Malachor V, turning the wreck of the Ravager into a spaceworthy ghost ship.

Although Darth Nihilus managed to stun the Exile, he was unprepared for the devotion of his former pupil Marr to the young woman.