10 Crazy In-Universe Rules Star Wars Characters Must Follow
3. Sith Must Respect Each Other... But Can Kill One Another
As a student to a Sith Lord, one is expected to carry out every order without question or hesitation. Any form of defiance will be met with a punishment of the highest order. As a result, an apprentice should be utterly obedient to their superior.
However, the only way for an apprentice to complete their training as a Sith... is to kill their master. Even though Sith Lords spend years or decades training their student, they know it is only a matter of time before the apprentice turns on them. In fact, Darth Vader has battled The Emperor in the comics, books, and video games on many occasions in a vain attempt to usurp his master's throne.
If the apprentice wishes to challenge their mentor, they're expected to take part in a lightsaber duel. But since the sith are... sith, they often rely on less direct methods to dispose of their rival. Sadly, Darth Plagueis learned this the hard way when Darth Sidious murdered him in his sleep.
What makes the Sith's hypocritical code of honour more ridiculous is how the darksiders would probably have succeeded at destroying the Jedi Order eons ago if they weren't so busy trying to kill each other.