Go to Atlantis and speak to Dyana, then choose Activate Stardust Insignia and follow the instructions.

Show Quest Info

Introduction

Look for Dyana carrying Diamond Insignia Wand and one Pure soul Gears, then choose the option Open Stardust Slot to Open Stardust Slot.
More gold are needed with higher risk in opening.
You can Auto producing other kinds of wands, but be aware of its needed materials Are from Energy Well instance and notice Different wands for different soul gears.
Please keep Vitality Stardust LV1 after finishing the quest which will be used in following quest Imbue Stardust.

NPC Dialog

You have to prepare a pure soul gear and bring the Diamond Insignia Wand, you'll learn how to Open Stardust Slot.
You can produce other kinds of wands by using Auto producing other kinds of wands option. Parts of materials are from Energy Well.