Use the Searing Cauldron near Ironhead Lake in Iron Marches to combine the Wyvern's Liquid Fire, Elemental Flames, Destroyer's Heat, a Flame Effigy Embers, and a Fire Imbued Heart to create the Ultra Hot Sphere.
Hint: Gathered by looting the Legendary Fire Elemental's chest in the Thaumanova Reactor of Metrica Province with the Thaumanova Flames Siphon in your inventory.
— In-game description
If this item was lost for whatever reason, it can be purchased again from the following vendor
|Grandmaster Craftsman Hobbs||Trader's Forum||Lion's Arch||1,020|
- Used, along with other collection items, to create the Ultrahot Sphere.