Guild Wars 2

I would like to make the Illuminated Fountain for my guild hall, and I need to make 5 Fountain Torches and each one takes an Essence of Light to make. I have searched and searched for this item, but have come up empty. The only clue I have been able to find was a post a long time ago by Link Hughes on June 19, 2015 where he says:

“Basic decorations can be purchased from a vendor in your guild hall, but catalyst materials found throughout the world can be used to transform one of the basic decorations into a special, finer version. For example, you’ll be able to obtain a Basic Stone Pool from the decorations vendor, but it’s a bit plain. High atop the Hidden Garden jumping puzzle in Mount Maelstrom, however, are a trio of air elementals that can drop an Essence of Illumination. Finding one of these essences will unlock a recipe that uses that essence to refine your Basic Stone Pool into an Illuminated Fountain—a much larger, lovelier tiled fountain ringed by softly glowing lanterns.”

I assume the name of the item changed since this post, and I farmed those mobs for hours without any luck.

Please help me out here!

Thanks for your time and help.