Jet Dragon

Breeding
The can be bred using an Ash Dragon and a Frostfire Dragon, in either order, at the Breeding Cave/Epic Breeding Island.

Earning Rates
Gem Earning Rates: Dragon Earning Rates without boosts.

Boost Calculation Guide to use with the page linked above.

Possible References

 * The 's description mentions "Wizard Lignius". This is likely a reference to lignite, a soft brown combustible sedimentary rock that is formed from naturally compressed peat.