Thousand Caves Door, truly encompassing a thousand caverns.
Apart from a few where disciples abound, most caverns have few disciples.
But even if there are few disciples, even if there's only one, it can constitute a cavern.
Through tens of thousands of years, the Thousand Caves Door, like the top ten Immortal Sects, has similarly experienced turmoil, even facing cataclysms.
However, ever since the Ancestral Elder established the Thousand Caves Door, out of a thousand caverns, not one has ever ceased its lineage!
Even when facing the greatest of cataclysms, each cavern must preserve a line of succession.
Such is the rule of the Thousand Caves Door.
Similarly, the Hundred Peaks Sect has done the same; since its founding, none of the hundred peaks have ever broken their lineage.