Fossil Dragon

Breeding
You can breed this dragon by Dark Dragon and Ice Dragon.But still there is a low chance for you to get this dragon,Penguin Dragon seems more common.

Damage Calculator
To explain, when attacking with Ice, Fossil deals double damage against Earth and Plant, half damage against Electric and Ice, and no damage against Dark. When attacking with Dark, Fossil deals double damage against Water and Metal and half damage against Plant and Dark. When defending, Fossil takes double damage from Earth and Plant, half damage from Electric and Dark and take no damage from Ice.

Counter Dragons
Gummy Dragon

Trivia

 * This is the 4th Special Release Dragon