Heir to the Empire by Timothy Zahn (Thrawn Trilogy, Book 1)

Joruus C'baoth (booo! hiss!) aboard the Chimaera, coordinating Thrawn's multi-pronged attack

   [Pellaeon] turned to look at C'baoth's strained face, an icy shiver running up his back. He'd never really bought into Thrawn's theory as to how and why the Fleet had lost the Battle of Endor. Certainly he'd never wanted to believe it. But now, suddenly, the issue was no longer open to argument. 
   And with the bulk of his attention and power on the task of mentally communicating with two other task forces nearly four light-years away, C'baoth still had enough left to do all this.
   Pellaeon had wondered, with a certain private contempt, just what had given the old man the right to add the word Master to his title. Now, he knew.

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Here, enjoy a sketch of one of my least favorite characters from one of my favorite book trilogies. He's not a bad character, mind -- rather, he's one of those villains you love to hate... I feel that way even more so after reading Timothy Zahn's Outbound Flight, which is set many years before this.