Attuned Lightsaber

All Lightsabers with the Energized sound type have the same sound, including the Attuned Lightsaber. This isn't the official name, and this Lightsaber sound type may be labelled something like weaponmeleelightsaber01 in the background of the game.

I do not have a video of the Attuned Lightsaber, but you can watch a video of the Volatile Conqueror's Saberstaff weapon to hear the Energized sound type, which is the same as the Attuned Lightsaber.

Read more about these weapons at the Knights of the Fallen Empire and Knights of the Eternal Throne Chapters Rewards Guide page on Swtorista.com.

Eternal Chapter weapons can be earned through the Knights of the Fallen Empire and Knights of the Eternal Throne expansion chapters. Each weapons piece comes from a specific chapter, and which specific look you get depends on your current Combat Style. You can earn these in the easiest version of the Chapters, you do not need to play Veteran or Master Mode. There are versions of this weapons with the same name but different looks from MK-1 to MK-8 - but only the MK-5 and MK-6 versions look like this from the Chapters. The Chapters just offer different-colored borders (green, blue, purple) depending on the difficulty, but three qualities have the same look.