Iron Dragon

Breeding
The can be bred by selecting a Metal Dragon or metal hybrid dragon to mate with an Earth Dragon or earth hybrid dragon at the Breeding Cave/Epic Breeding Island.

Breeding an Earth Dragon with a Metal Dragon may also result in a Scoria Dragon.

Earning Rates
Coin per minute: Level 1: 3 / Level 10: 21

Dragon Earning Rates without boosts.

Boost Calculation Guide to use with the page linked above.