Talk to Berminham.

Show Quest Info

Introduction

Once a Stardust Insignia is placed on the gear, Dyana in Atlantis will teach you how to imbue Stardust. There is a chance to get more power out of each Stardust you imbue.
Talk to Berminham to enter the Energy Well. Kill monsters in Energy Well to get Stella and other materials, which you can exchange for Stardust materials from Dyana's shop.

NPC Dialog

Imbue Stardust into Soul Gear at Dyana. Stardusts can be imbued into different pieces, so pay attention to the shape.
In the Energy Well. You can find materials and gain Stella, which can be traded to Dyana for special materials.

Quest Completion

Save the Energy Well and collect materials and Stella, then I will help you more.