In order to craft Blackstar Awakening Weapon you need following materials
Remnants of the Rift
Concentrated Boss's Aura x3
Specter's Energy
Concentrated Boss's Aura
To obtain heat one of the following materials
Kzarka Mainhand Weapon
Offin Tett Mainhand Weapon
Nouver Sub-Weapon
Kutum Sub-Weapon
Dandelion Awakening Weapon
How to craft Blackstar Awakening Weapon
Click RMB (right mouse button) on Remnants of the Rift and start the Questline. Once you reach Stars End you come to a point where you can choose the easier/weaker boss or the hard boss on Stars End. You always wanna take the hard boss since its faster and not hard at all. If your Quest leads you infront of a Brazier you need to combine
Concentrated Boss's Aura x3 and Eye of Anguish to obtain Eye of Desolation. Put Eye of Desolation into the Brazier and jump down the crater to fight the Boss. After you killed the boss you continue with your Questline till you reach Dorin Mogrim at Helms Post. If Dorin Mogrim asking you for Specter's Energy just give it to him and the Questline should comming to an end soon.