A.N.: This is a crossover with Star Trek, the reboot movie series. Before this, Spock was given a mission by Starfleet to infiltrate the Galactic Empire.
Spock, under the assumed alias Firmus Piett, watched his lord, Darth Vader, with a mild sense of anxiety. Darth Vader was the only being in the universe who could draw any emotion out of him. The fact that his Kolinahr was incomplete, or reversing itself, would have irked him if he were capable of it. However, it wasn't surprising; he had undergone kolinahr in the months following Vulcan's destruction. His grief over his lost world had been killing him and kolinahr was his one chance of survival. In the end, his father had to make him undergo it; Spock himself simply hadn't cared enough.
"You have failed me for the last time, Admiral," Vader growled out, bringing Spock back to the present. "Captain Piett." Spock stepped forward, anxiety rising to true fear as he tried not to watch Admiral Ozzel dying beside him. "You are in command now, Admiral Piett."
Spock's eyes widened. His breath came in short gasps, his heart raced, and his gloves filled with sweat. He knew with absolute certainty that he'd never been in more danger of dying, nor had he ever been quite so desperate for life. The terror that filled him was as icy as the frost that had formed on Vulcan for the first time in a million years; his last sight of his doomed homeworld. The logical part of him noted with some irony that this was the first time he'd felt warm since then. "Thank you, Lord Vader." Vader cut the transmission as Spock nodded for Ozzel's body to be removed. The terror ebbed back down to a normal level of mild anxiety, leaving Spock feeling empty and craving more.