Sliquifier

The Sliquifier is a Tidal Class dragon. They were first mentioned in Dragonpedia, then appeared on Hiccup's map and on Fishlegs' cards in How to Train Your Dragon 2 and To Berk and Beyond, but it first appeared in the Book of Dragons short. They are the natural prey of Scauldrons.

Official Description
"This supersonic swimmer is among the fastest in the Tidal Class. So loyal and trustworthy it may even let a rider sit in its mouth... without eating him. The swift-moving Sliquifier uses its speed to churn up a powerful acid stream to fire at its opponents."

- Dragons: Rise of Berk

Physical Appearance
The Sliquifier is comparatively smaller than other dragons. It has a dolphin-like tailfin, a long neck, and a small fin lining its neck. There are thin tentacle-like strings under its chin. The Sliquifier in How to Train Your Dragon 2 is portrayed as green with a short tail, two wings, and two small fins, bearing resemblance to a seal. In Dragons: Rise of Berk and later School of Dragons, the Sliquifier is portrayed as having a sea green body with bright purple wings and tail and a mouth that glows blue. Instead of two fins, this later version has four legs.

A Titan Wing Sliquifier in Dragons: Rise of Berk is yellow, close to golden, in color. Its wings and tail fin are bright blue but has a few green spots on it. The fin on its long, slender neck is larger and it has more tentacles on its chin.

Firepower
Like the Changewing and several other dragons, the Sliquifier emits acid. It uses its speed to churn up powerful streams of acid before attacking its opponents. Sliquifiers make their blasts stronger as they increase their speed at the time of release. Although the Sliquifier is a slow shooter, it is able to use its speed to make its powerful blasts even more of a threat.

Speed
The Sliquifier is the fastest swimming Tidal Class dragon. Its speed makes it useful to hunt prey and escape from danger. The Sliquifier also uses its speed to churn up acid. As its speed increases, the power of its acid increases too.

Behavior and Personality
This dragon is incredibly loyal and trustworthy and would do nothing to harm its rider.

Book of Dragons
Three Sliquifiers make a brief appearance in Book of Dragons. Coincidentally enough, they are seen behind a Scauldron, their main predator, further strengthening the connection between these two dragon species.

How to Train Your Dragon 2
Fishlegs is shown with a number of dragon cards, including one with the Sliquifier.

Dragons: Rise of Berk
The Sliquifier was first introduced in Dragons: Rise of Berk. One particular Sliquifier that was introduced was, Grazefall.

School of Dragons
Following its debut in Dragons: Rise of Berk, the Sliquifier also became available in School of Dragons.

Trivia

 * The "Dragonpedia" on the How to Train Your Dragon website stated that Scaudrons hunted Sliquifiers down to near-extinction.
 * Said text has now been removed from the Scauldron's Dragonpedia page. The word Sliquifiers has been replaced by the phrase smaller species. However, Hiccup's online Dragons: Race to the Edge map and Guide to the Dragons Volume 3 still mention Sliquifiers.
 * The Sliquifier may have evolved it's incredible speed to escape predators like the Scauldron.
 * It is the first dragon species to be hunted to near-extinction, with the second being the Buffalord.
 * However, the Buffalord was hunted by Vikings, while the Sliquifier was hunted by Scauldrons.
 * Sliquifiers are small in size when compared to a Scauldron, as well as to most other Tidal Class dragons.