Bring a piece of Purified Soul Gear that corresponds to the Starword you have chosen, then Imbue the Starword at Dyana in Atlantis.

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Introduction

Starword has its own strength. With the pure soul gear and proper stardust, it'll show its potential power.
First,Dyana will guide to carve starword in a pure soul gear.
Please keep Diamond Insignia Wand, which will be used at the quest Open Stardust Slot.

NPC Dialog

It's time to learn to Imbue Starwords.
Starwords can be Imbued into Purified Soul Gear. They can activate powerful secondary attributes as long as the correct Stardusts are already imbued into the Gear.