Tyrant Dragon

Tyrant Dragons (暴龍) are wild creatures who can singlehandedly level a town. However, even ten of these creatures can't destroy the magical container barrier caused by the Eternal Seal Spell.

Appearance
They are large dragons that have long heads and spikes coming out from the back of their heads and from the bottom of their lower jaw. They are also shown to have very well developed muscles.

Personality
They are wild and uncontrollable beasts.

History
Nothing is known of them yet except that they have destroyed towns throughout Britannia and the Holy Knights created a spell as a countermeasure to trap them and other powerful beings, such as the Seven Deadly Sins.

Plot
They are first mentioned when Golgius invokes the Eternal Seal spell and says that even ten of these creates couldn't destroy the spell.

Hauser and Gilthunder arrive to stop the army of the Northern Barbarians on a flying dragon, which may have been a tyrant dragon.

Abilities/Equipment
They appear to be extremely powerful dragons who have the power to singlehandedly level entire towns.