Vimana: Throne of the Heaven-soaring King (天翔る王の御座, Sora Kakeru Ō no Mikura?) is a flying contraption passed down from Babylon to India and recorded in the two epic sagas, Ramayana and Mahabharata, that is owned by Gilgamesh and contained within the Gate of Babylon. It is a golden and emerald ark, a high-tech Indian Noble Phantasm that would make even Area 51 pale-faced, fueled by a solar crystal, rutilated quartz crystals, that burns mercury as fuel. It surpasses the laws of physics by traveling at the speed of thought, and it can easily outpace a modern jet while Gilgamesh is simply playing around. It has a pilot throne that can be withdrawn in emergency situations, and a control column, which isn't used due to interference with the operation of the Gate of Babylon, is placed directly in front of it.
He can freely use the Gate of Babylon to launch projectiles while piloting the vessel, and he can also summon shields to block midair projectiles. Within the myths of ancient India, it was apparently loaded with a variety of weapons ranging from ancient machine guns to ancient nuclear warheads, which have been collected and stored within Gilgamesh's treasury. It has many other capabilities detailed in the Vaimanika Shastra, a technical guide following descriptions written about the Vimana in the 10th Century BC, including flying in a zigzag motion, deploying its wings to travel at high speeds, employing emergency evasion techniques to avoid collisions with other Vimana, optical camouflage and stealth functions, communication interception, the use of laser beams, and the deployment of biological weapons. It is also possible all of its functions were not described.
Gilgamesh uses it to engage Berserker's F-15J Fighter Jet, and after believing it to have no way to attack from the rear, the Vimana is engulfed and shot down by incendiary bombs transformed from the jet's flare dispenser. It is also used by Gilgamesh in the world of Fate/kaleid liner PRISMA☆ILLYA, differing that it is completely black like his corrupted self. It is able to easily escape from underground below 1.6 million tons of concrete and 7.2 million tons of bedrock.
In the events of Fate/Grand Order, Vimana appeared in the Indian Lostbelt which serves as the base of operations and resting place of God Arjuna. Unlike Gilgamesh's Vimana, God Arjuna's Vimana takes a form closer resembling a floating fortress as it was described in Hindu myths.
 Fate/Zero Blu-ray Disc Box II English Translation booklet: Master Session 001 - Caster Side, p.005-007
Master Session 001 - Caster Side
Where did you draw your portrayals of Caster and Ryunosuke from?
Tsuruoka: Some of it comes from looking at the visuals. The bulging eyes says it all. I learned from reading the novel that he has a talkative personality, so I thought I would play him in a kabuki style in spite of the fact that he's European. I based his speaking styles on big actresses and entertainers and decided that he would tend to use kabuki tones when he becomes emotional.
Ishida: Back when I first played him in "Sound Drama", I thought to myself, "Boy, this character is horrible" (laughs). "A character like this can only exist inside a story." Plus, since "Sound Drama," had no visuals, I had no choice but to rely on the insanity inside myself. Even at the risk of being misunderstood, I believe that Ryunosuke's emotions are ones that everyone had deep down. I thought I would give that a broad interpretation. I was a bit hesitation when I first started playing him, but then I gradually started thinking. "Hey, it's fun to be able to cut loose like this." In the end, I've managed to reach a place where I understand Ryunosuke, as dangerous as that sound (laughs).
When Ryuunosuke was shot (#14), I was overjoyed that I was able to feel, "Oh, no...Ryunosuke..." That scene was original to the anime, and I recorded two versions after discussing the performance with Director Ei Aoki. One was an upbeat performance, like, "But do not worry, Ryunosuke!" The other performance, "You have died and left me alone" was sadder, said as if he was cradling Ryunosuke. The former was chosen for the broadcast version, but at the end, I go, "Behold, Ryunosuke!" As a performer, I was happy that he had realized that Ryunosuke still existed somewhere inside his heart.
Caster's Master. His fascination with, and lust for, death leads him to become a serial killer who commits murder after murder. He has two piercing, a chain at his waist, and a quiet disposition. The bracelet on his wrist is a magical item given to him by Caster, however, it is destroyed by Rin Tohsaka. Atsushi Ikariya was in charge of the character design for the anime version.
True name: Gilles de Rais. Doubting God, he becomes a Heroic Spirit to try to resurrect the holy virgin Joan Of Arc. In the original novel, he is described as having "huge, rolling eyes and oily, glistening cheeks." Because he was originally a knight, he has a muscular build. Atsuhi Ikariya was in charge of the character design for the anime version
A divine treasure. A shining ship housed within the Gate of Bablyon, the treasury of Acrher, the Heroic Spirit Gilgamesh. Made of gold and emerald, it has an emerald-encrusted power core and variable wings. At its center, there is a golden throne that acts as its control seat.
 Fate/Zero material- Encyclopedia: Vimana [Noble Phantasm], p.091
Vimana [Noble Phantasm]
The King’s soul resides in golden armor. Vimana was flown in the sky for the first time in the third volume – His Majesty the King of Heroes’ mobile air weapon. It uses solar energy, produced from a solar crystal that burns mercury as fuel, to move – a high-tech Indian Noble Phantasm that would make even Area 51 pale-faced. Even though in ancient Indian mythology, it also had weapons ranging from ancient machine guns to ancient nuclear warheads, these surely have already been gathered in the treasury of the King of Heroes.
Fate/Zero Anime Visual Guide II - Vaimanika Shastra According to the technical guide Vaimanika Shastra, which follows descriptions written about the Xth century BCE Vimana, the Vimana can fly in zigzag, deploy its wings to go at high speed, has emergency evasion techniques to avoid crashing into another Vimana, has an optic camouflage, stealth functions, can intercept communications. It also includes descriptions of use of laser beams and biological weapons, and it's possible that not everything it could do was described.
- Fate/Zero - Volume 3, Act 10
 Fate/Zero material - Weapons: Vimana, p.120-121