system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Has the Baneite lineage of Sith ever had to start over from nothing?

I've been thinking, it'd only take two, possibly one, Sith to ruin it by dying without an apprentice, both the apprentice and master killing each other, or the apprentice and master both getting killed by someone else.

Has anything like this happened? And if so, how did it start up again? 

If it didn't happen, would it be possible for someone with Sith holocrons to become a Sith without having a Sith master? Or would they not legitimately hold the title?
gpt
The thing about the Sith is they always have a backup plan. The Master must be powerful enough and clever enough to survive their training, ascension, and subsequent teaching, and if their Apprentice expires, they always have plenty of acolytes ready to replace them. When the Apprentice usurps the Master, they adopt that custom, and thus there is never any risk of the Sith dying out.

The Rule of Two is what makes the Sith who they are. To call oneself Sith without having learned from a true Sith master is to be a fraud. No holocron can teach you what it truly is to be Sith, because the Sith are constantly changing. No matter how useful the holocron, it is no substitute for a master.