One standard month later—
The North Sea of Bal'demnic crashed around them in a stormy froth, but the Muun cultist Melkor Damask looked entirely unfazed. A month prior, he had begun the process of training a new apprentice, Kholvar Varaxes, and today was the day he proved himself worthy of that station. Just like the ancient Sith before them, those members of the Sith Eternal chose a pivotal moment early in their training to construct a lightsaber. So would it be with Kholvar if he was strong enough with the dark side.
"This cave," he was saying while nodding to the mouth in the side of the nearby cliff, "was used by the Sith of Darth Bane's era to construct their lightsabers. I can furnish the material you need to construct your weapon, but first you require a kyber crystal. One that has been made to bleed." Melkor paused, then continued, "Before that, though, you need to reach the cave. To do that, you must rely upon all that you have learned this past month. Search yourself for your fears, your anger, your hatred — focus them — and the way shall open to you."
The instructions were deliberately cryptic. Melkor had sensed his apprentice's eagerness to construct an energy blade of his own growing over the past week. But this pilgrimage was more than just a lightsaber-constructing expedition. It was a test. Many cultists had come to the Muun for induction into the Sith Eternal, and training. Two were currently full members. The rest were skeletons beneath the very waves above which they currently stood. For Melkor, it was time to see whether Khlovar's bones would join them... or whether he would become something more. @Logan