Vader: "Oh I guess it doesn't hurt since it's all bullshit, huh? I find your lack of faith disturbing. Especially since you've seen me do this shit, like, a million times before."
Wasn't he more criticizing the scale? Like, a sith warrior is great, but he can't really compete with the power of the Death Star when it comes to sheer scale. Just ask Alderaan.
In case someone also wondered who this is, here is a summary. Dude is hardcore
Darth Nihilus: A Sith Lord's Hunger for Power and Destruction
• Darth Nihilus, a Human male, rose as a Dark Lord of the Sith after the Jedi Civil War, driven by an insatiable hunger for Force energy.
• He was found by Darth Traya and trained to feed his hunger, eventually becoming one of three Sith Lords in a triumvirate.
• Nihilus' hunger consumed him, leading him to destroy entire planets and absorb their Force energy, including the devastation of Katarr.
• He formed a powerful bond with his Shadow Hand, Visas Marr, who could support and weaken him in battle.
• Nihilus' pursuit of a growing Force presence led him to clash with Meetra Surik, a former Jedi, and ultimately met his demise at the hands of Surik and her allies.
Force drain is one thing where he always has to be constantly feeding to survive. The Death Star, especially 2 with it's 1 min recharge time, if it had been finished could jump to any systen fire at any planet and vaporize it. Then it could wait a few minutes with its incredible defenses or jump away within a few seconds.
The death star is terrifying when the Empire is actually competent.