Leviathan

The Leviathan is a massive aquatic Creature of Grimm that made its first appearance in "Seeing Red".

Appearance
The Leviathan appears to be a gigantic, bipedal, reptilian-like sea creature with four humanoid limbs and a long tail. It has four gills on each side of its neck and a collection of dorsal plates protruding from its back, with red webbing between each plate. It has a dolphin-like head with a mouth filled with sharp teeth and three yellow eyes on each side of the head. Like many other Grimm it has external ribs.

While underwater, its eyes and red lines on its face-plate glow.

Powers and Abilities
Being an aquatic Grimm, the Leviathan can swim and breathe underwater. It can also exhale a stream of electric fire. It has tough skin that is resistant to missile blasts.

The Leviathan is also fairly intelligent as after being blocked by Argus base perimeter shield it targeted the shield generator with its electrical fire breath to disable the shield.

Trivia

 * The Leviathan (Hebrew: לִוְיָתָן‬) is based on its real-life counterpart. The name לִוְיָתָן‎ is a derivation from the root "לוה‎", meaning "to twine; to join", with an adjectival suffix "ן-‎". with a literal meaning of "wreathed, twisted in folds". The meaning of לִוְיָתָן in Modern Hebrew is whale, which is also an enormous aquatic creature.
 * The Leviathan is the largest Grimm in the show.
 * In RWBY Rewind Episode 11, the hosts, Chad, Jackie and Ellie, gave the Leviathan the nickname 'Lenny'. Later in the episode, Kerry Shawcross states that he nicknamed the Leviathan 'Levi' as he did not want to write out 'Leviathan' in the script.