From Dragon Mania Legends Wiki
The Ancient Element is the thirteenth and final Element encountered in Dragon Mania Legends and it is unlocked at Level 5. In relation to base Elements in battle, it is strong when used against Wind, Plant, Light and Shadow, and is weak against nothing. Furthermore, it is not vulnerable to any other Element, but resistant to Fire and Metal. All Ancient-Element Dragons that have this Element as their primary Element are classified as Ancient and can live in the Ancient Habitat.
The Ancient skill is Damage Leech, which temporarily reduces the enemy's damage and increases the caster's damage by the same amount.
There is no Base Dragon. There are currently 13 Dragons with the Ancient Element.