Legendary Dragon

Legendary Dragons are one of the many breeds of Dragons found in Tamriel. They are the most powerful Dragon sub-type known to exist in-game.

They are introduced in and typically appear throughout Skyrim at level 78.

Appearance
Unlike other breeds of Dragon, Legendary Dragons have distinctive thick, curved horns. They have a black and purple scale color. They are also unique in having what appear to be compound eyes, formed of multiple "eyes" in a single socket.

Combat
The Legendary Dragon behaves like any other dragon in combat. It attacks with Fire or Ice breath, and may sometimes land either on its own accord. Along with the Revered Dragon, it uses the Drain Vitality shout along with Frost Breath and Fire Breath.

Notable items
Along with Dragon Bones, Dragon Scales, gold and gems, Legendary Dragons also have a chance to drop Daedric weapons and armor.

Trivia

 * The Legendary Dragon is stronger than Alduin in terms of Shouts, health, and bite damage.

Bugs
Fix
 * As with all other dragons, when defeated, you might not be able to absorb his soul.
 * The problem occurs when you have too many souls; spend one and you'll absorb his soul.