Holocron is, sadly, wrong. Temptation is/was a Tionese main hand (I know, my Sorc has one). It was never dropped by open world champs, so could not have been affected by a Champ Loot Nerf. All of the original three tiers (TIon, Columi & Rakata) were removed as dropping items in 2.0 so there is currently no way of obtaining them (we also lost "The Unslung Hero", "Darth Scion's Lightsaber", "Easy Credits", "Project Claw", "Edge" and many more)