Katla

Katla is the secondary antagonist of the swedish 1973 novel The Brothers Lionheart and it's 1977 movie adaption. She is a large female dragon and the pet of Tengil, the main antagonist of the movie.

History
She has been sleeping for thousands of years until awakening and attacked Tengil's castle but her attack ceased when Tengil blew in a horn. Whoever blows in it she obeys and she is chained to the Karmafalls where she looks after her enemy Karm.

Some time later, The Lionhearts brothers spots the huge dragon one night seeing her bellowing.

She is summoned again by Tengil and burns several of Cherry valley's citizens until Tengil loses the lur to Jonathan Lionheart, one of the protagonists. Jonathan uses the lur to make Katla kill Tengil, but Katla later burns Jonathan, mortally wounding him. Before dying, Jonathan manages to push a large rock onto Katla, making her fall into a river. In the river, she battles another great beast, Karm the lindworm, and the two monsters kill each other.

Powers and Abilites
Her fiery breath can kill anyone instantly, if those who survives her flames, they get instead paralyzed.

The scale of Katla is so strong that no weapon can injure her or even leave a scratch.

Given she has two wings, she may have the ability to fly.

Trivia

 * Katla is named after a volcano on Iceland.
 * Katla was made of a four meters tall and eight meter long model operated by four people, it could blink and swing the tail as well a inbuilt flamethrower to make it breath fire.
 * In the movie she is not killed by Karm but instead drowns by a boulder.