A Glowing Solstice
Add the maximum amount of Kindling to a piece of Sunlit armor from the Armor Details screen.
Doing so will fully rekindle the armor, unlock the armor's glow, and allow you to imbue it with a Spark.
Your armor is nearly fully rekindled. Soon you will be able to imbue it with a Spark.
"Just like a bonfire, your armor will need a lot of kindling." —Eva Levante