Sword Stealer

The Sword Stealer is a Mystery Class dragon introduced in Dragons: Rise of Berk. It was first seen in a sneak peek video for the battle mode update, were a titan level 52 was shown. The Razorwhip was probably based off this dragon as it too has reflective scales, although it uses its magnetic skin to forge it's self an armor.

Description
Sword Stealers have a magnetic personality... literally! Vikings that get too close find their swords and shields stuck to the Sword Stealer's hide!

Appearance
The Sword Stealer is a mostly black dragon with some gray and white details. It has two wings and two legs. The tip of its tail ends with a arrow-shaped triangle. This dragon is unique in that where the wing claws would be located, it instead has triangular spear-like tips like in the tail. It seems to be carrying a sword on its legs, which is most likely an actual sword, attracted to its magnetic skin. The Sword Stealer's size is very large, possibly as large as a Boneknapper. it is also very similar to a razorwhip as both have metal (or metal like, in the case of the Razorwhip) scales.

Abilities
Its magnetic skin attracts metallic objects like swords and this probably acts as a defense as it coats itself with a strong armor of metal. This is similar to that of a Boneknapper collecting bones to shield its delicate body.

Titan Wing
Source: Dragons: Rise of Berk

Titan winged Sword Stealers are yellow, close to golden in colour while their wings, chest and mouth glows blue. Also, they have an arrow-shaped tail. Their wings have brown stripes along it too.

Trivia

 * Newly born Sword Stealers are completely yellow instead of a dark color, as it does not have any metal armor.
 * The Sword Stealer bears a strong resemblance to the metal Boneknapper concept art.
 * The Sword Stealer possibly attracts metal purposely for armor, like a Boneknapper. Instead of just having magnetic skin.
 * The Sword Stealer is similar to the Smothering Smokebreath by using metal to coat itself. It could be based off the first Smothering Smokebreath that were seen in Wild Skies.
 * In Rise of Berk, the battle Sword Stealer has a green glowing mouth instead of an orange one. The reason for this is unknown, it may simply have more copper or other green burning chemicals in it's fire or could be used for telling them apart.