Wyvern (RWBY)

The Grimm Dragon is a large, dragon-like species of Grimm in the world of RWBY. It makes it's first appearance in Volume 3 during the episode "Battle of Beacon".

Appearance
The Grimm Dragon, true to it's name, resembles that of the enormous winged dragon, with large red bat-like wings, a pair of legs and a tail. The red membrane of the wing is translucent. It has rough black skin, with white bone-like spines along its body, including an external skull, rib cage and rows of dorsal spikes.

It also has three bony spikes on its tail and large claws on its hind legs. Its skull has a pair of large prominent horns and six yellow-red eyes. Its jaw has teeth extending down along the creature's neck, beyond its skull, such that its entire neck also opens when it roars.

Volume 3
In "Battle of Beacon", the conflict and negative emotions during the destruction of Beacon and Vale is enough to awaken the Grimm Dragon lying dormant in Mountain Glenn. Breaking free of the mountaintop, the Dragon roars as it makes it's way toward Beacon Academy, creating multiple Grimm as it flies across the city.

In "Heroes and Monsters", the Grimm Dragon flies past Ruby on the airship as it finally arrives at the school. Focusing on the Beacon Tower, the Dragon begins circling the building.

In "End of the Beginning", the Grimm Dragon finally climbs to the top of the tower, where it begins roaring furiously. Cinder Fall arrives atop the tower as well, walking towards the massive beast and telling it Beacon is it's home now, the beast mysteriously becoming mellow at her presence.

When Pyrrha Nikos arrives and begins battling Cinder, the Dragon flies off the rooftop and begins destroying the tower, disabling the Cross Continental Transmit System and giving Cinder an advantage against Pyrrha. Upon arriving at the top as Cinder kills Pyrrha, an grieving Ruby suddenly releases a tremendous amount of power, which envelops the Dragon in white light and "freezes" it in place.

Though no longer active, the Dragon still remains alive and continues to draw in more Grimm as it stands frozen perched on the side of the tower following the battle.

Abilities and Powers
While it's combative abilities have yet to be shown, the Grimm Dragon is shown to have the unique ability to spawn many smaller types of Grimm via a dark ooze that drips off it's enormous body. It's also revealed to be quite strong, destroying the entire Beacon Tower with one hit.

Trivia

 * Dragons are a mythical flying reptilian creature present in many cultures.
 * As the Grimm Dragon has two legs with its front arms attached to its wings, it could also be considered a wyvern, a subspecies or relative of dragons. Miles Luna calls it a "Grimm dragon wyvern" in the Volume 3 Directors Commentary.
 * The Dragon was designed by production/concept artist Erin Winn.
 * On the Volume 3 commentaries, the Dragon's ability to summon Grimm from the liquid that leaks off it is described as a sneak peek towards the origin of the Grimm.