Kurage Kurage no Mi, Model: Crystal Jellyfish/Rook

Rook is the third gear Zetwal created. It like the rest of the stronger gears can be utilized together with Bishop and Knight for even deadlier effects, this maneuver is referred to as castling.

Overview
An extremely complex gear that makes use of a Jellyfish's unique physiology. By hybridizing a super majority of her body to Mesoglea (the non living jelly like substance inside a jellyfish's body) Zetwal effectively becomes one giant balloon of jelly increasing her resistance to blunt damage.

Furthermore by utilizing her entire body as a way to draw in nitrogen only from the atmosphere and then compressing it in her body, followed by a slow release of it into the jelly like substance Zetwal can greatly decrease her body temperature in a process similar to the production of liquid nitrogen. This effectively freezes portions of Zetwal's body, solidifying her body to extreme levels.

Defense
As the jelly inside her body freezes and hardens so does Zetwal's overall defense, making her tougher than most metals completely riding her of her weakest stat endurance. Rook's defensive ability is so great that bullets and swords wielded by anything but masters and the best weaponry guns bounce off Zetwal in this form.

Offense
Because of the incredibly low temperature of her body in this state Zetwal's attacks now become able to induce freezing to some extent on the enemies as well as all her attacks becoming that much more physically hard, turning what would be a normal sensation of a punch into a much more painful one.

Castling
But Rook's true terror comes from the fact that Zetwal is still fully capable of spawning as many tentacles as she desires, in the maneuver known as Castling Zetwal becomes fully capable of utilizing both Bishop and Knight to further increase her offense, mobility, defense and utility.

Furthermore because they also start to freeze to some extent the Castled Bishop and Castled Knight have additional defense added on top of them even if they lose some of their speed.

Drawbacks
Perhaps obviously this maneuver removes some of Zetwal's inherent mobility, not that this presents much of a problem with the use of Castling with the Knight's mobility. Instead the biggest drawback of this technique is that Zetwal receives immense cold damage and risks death when using it for prolonged amounts of time.

Named Techniques
TBA

Trivia

 * To keep with the chess theme this gear was designed for enhanced defense as rooks are the most defensive piece in the game, capable of performing castling with the king to protect it.