The zombie Jiao-dragon is a snake-type demon beast, born from a mountain of thousands of corpses. They grow by devouring the power left behind from the corpses, that is then formed into a creature with intelligence. All fully-formed zombie Jiao-dragons have Legend rank strength. After each millennium, the zombie Jiao-dragon would become stronger by one level. Upon reaching ten thousand years, it would become an existence that could rival the Spiritual Gods.  A zombie Jiao-dragon's body is covered in black scales and will get smaller as it gets more powerful.
Their attacks have a strong corrosive attack, so they are most likely a Dark-Type demon beast.
There are many zombie Jiao-dragons on the first layer of the Nine-Layered Deathlands in the Nether Realm deep in a murky lake, including a very powerful one. This has not reached Demigod rank yet, but it does have some type of treasured Scarlet Pearl embedded in its head.
After being attacked by six legend rank experts, including Cang Ming and Mu Ye, the scarlet the zombie Jiao-dragon was able to pull strength from the pearl. Its a level raised and a layer of red scales covered its body, with two long feelers growing from the corners of its mouth. When in trouble it can call on the other Jiao-dragons within the lake to assist it.
Just as the Zombie Jiao-dragon was about to be struck down by Cang Ming, it was saved by Xiao Yu. In order to protect the Jiao-dragon's life he removed the treasured Scarlet Pearl from its forehead and it immediately reverted back to its normal self.