EastScape Wikibuilt from the game itself
Sparking egg
“Put it in a hatchery on your island with 3 Ordinary pet food: a Stormling in 24 hours. Tradable.”
Hatches
Hatches into 
Stormling in your island's hatchery, in 24 hours. It drops from monsters in The Boneyard, Cloudreach.
Sold by
Nestor the Egg Man in The Yard trades it for 100 storm jelly + 60 static pelt.
The Store: 180,000 tickets.