The Coal Dragon-smelting Furnace!
It was an Elixir Furnace similar to a tripod, whose mouth was 100 feet wide. Dropping down from the sky, it had great suction and a high temperature that made Zhou Bao stop breathing.
"Good opportunity, boy, this is a good opportunity!" Beside Zhou Bao, Green Spirit suddenly exclaimed. "Although the Coal Dragon-smelting Furnace is a Pure Yang Celestial Device, the fire inside it is Coal Essential Gang Fire. It's not as strong as Heavenly Fire, but it's a top fire among all the fires around the world. If you fuse it into your Tusita Fire, the latter's power will be increased sharply. Furthermore, this Elixir Furnace has nine holes and 12 apertures. You can further improve your Elixir Furnace after fusing it."
"Improve my Elixir Furnace?" Zhou Bao was a little confused.