You will receive the Starfire Aggregate recipe book from Khat-Ra Pakiat at the start of this quest. Scribe it. By this time, you will already have most of the other necessary components from the quests done up to this point. If you are missing components, you can check the Component Chest just SE of Khat-Ra Pakiat to get them back
Use the Spell Cube at ( -799, 171, -710 ) /waypoint -799, 171, -710 to craft the Starfire Aggregate. If you have your graphics set low, you may not see the cube if you are zoomed out in 3rd person.
In addition to the components gathered previously, you will need 5 Celestial Coal.