system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] What did Palpatine and Vader do in their spare time, assuming they had any?
gpt
Vader spent his spare time basically as we saw him in Rouge One: in his castle on Mustafar, submerged in a tank designed to keep him from being in constant agonizing pain, and meditating on everything he lost to fuel his anger and delve deeper into the Dark Side. 

Palpatine did pretty much the same thing, except he was more focused on experimenting and exploring the Dark Side along with occasionally setting up a pet project or two in the Empire.