Earthstomp: The ancient dragon rears up and jumps up to crash back down onto the ground. AoE chance of stunning creatures around it and knockback effect.
Other Dragon Special Ideas:
Divebomb: Flying dragon targets a creature on the ground while it's flying. (Player clicks on divebomb) The dragon dives rapidly (straight falling speed) and hits the creature. Damage taken is based on total distance of the fall (good incentive for max view range) and the dragon's Tooth&Claw rating.
Effects of Divebomb: Stunning effect, knockback, and MASSIVE damage.
Recovery Time of Divebomb: Doesn't matter as it's kinda a 1x per battle thing.
Negative effect of divebomb: Dragon is stunned for a short duration afterwards too. (After all, you did just do a nose-dive into the earth)
Just a couple Ideas;
Whaddya Think?