ARWEN

Arwen is Craymen's second in command. He is the first officer, vice-captain, you name it. He also has the honor of commanding the Black Fleet's flagship when Craymen is away on business. He also seems to be a suck-up, always calling him "Lord Craymen" instead of Craymen.

Sadly we don't see much of Arwen. He gets a few lines in Saga's intro, then we next see him at the end of disc 1 after Edge has gutted his flagship. Arwen presumably goes down with the ship. We don't see it, but when Edge is talking to him it looks like he is hanging on by a thread.
I'd imagine Arwen is the reason why Craymen knew Edge was after him. Arwen could have radioed in that the "kid from the site" was after his flagship. On the other hand, it could have been Zustava, but I doubt it. He'd be too busy fighting and laughing...and laughing...and laughing...to call in. He might be a good pilot, but he's no socialite.
So, presumably, Arwen went down with the Black Fleet's flagship at the end of Disc 1 of Saga.