A Glowing Solstice
Open the Details screen on a piece of Sunlit armor with Small Kindling. Add the Large Kindling under armor mods.
Doing so will allow you to imbue the armor with Shining Embers.
Adding more Kindling has unlocked more of your armor's potential. But it's not ready to light just yet.
"You can't start a fire without some kindling." —Eva Levante