Gear Third is one of the applications of Monkey D. Luffy's Devil Fruit, known as Gomu Gomu no Mi. This gear debuted during the Enies Lobby arc of anime series One Piece where the Straw Hat Pirates fought Cipher Pol of the World Government in order to rescue Nico Robin from their clutches.

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Using its astounding powers, Luffy was able to completely decimate those who stood in his way at the Government stronghold. Over time, this technique has only gone on to become stronger and remains one of Luffy's strongest skills to date. Here are 10 things that you probably didn't know about Monkey D. Luffy's Gear Third.

10 How It was Developed

Gear Third was developed by Monkey D. Luffy in between the Water 7 and Enies Lobby arc. After clashing against the Cipher Pol at Water 7 and losing bitterly, Luffy came up with the idea of developing Gears to get stronger.

Along with Gear Second, Luffy also developed Gear Third, both of which proved to be extremely important in defeating CP-9 as the story went on. Over time, Luffy's control over this ability has gotten better and therefore, its powers have grown significantly, and its side-effects minimized, at the same time.

9 Its Debut

Having developed the first two Gears on the way to Enies Lobby, Luffy hinted towards using this power in his fight against Blueno first. However, due to Blueno collapsing after taking the brunt of Gear Second attacks, Luffy didn't feel the need to go through with the process of using it. Later, this technique was used to bust a large steel door at Enies Lobby.

However, Gear Third only made its full debut when Luffy fought Rob Lucci and Gear Second proved to be falling short of granting him the power to deal with the CP-9's strongest.

8 Its Mechanics

Gear Third is activated by Monkey D. Luffy by biting into his thumb and inflating his body through his bones. With the bones growing larger and stronger, Luffy is granted immense strength, capable of shattering a Marine battleship in a single blow.

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Interestingly, Luffy used a similar technique, known as Gomu Gomu no Fuusen (Gum-Gum Balloon) prior to developing Gear Third. However, the key difference between the two is that Gear Third specifically focuses on inflating the bones, which is why Luffy sometimes calls this technique 'Hone Fuusen' (Bone Balloon) in Gear Third.

7 Its Side-effects

Much like Gear Second, Luffy's Gear Third can be seen taking a huge toll on his body. When used for the very first time against Rob Lucci, Luffy brings forward his inability to maintain his original size when the power is deactivated. As Luffy exhales the air from his body, he shrinks to the size of an average Tontatta.

The longer Luffy uses Gear Third, the more time he'll spend in the shrunken form once deactivation of the gear takes place. However, after the two-year time-skip, Luffy doesn't show this side-effect, implying that he has mastered this technique entirely over the course of the said time.

6 Its Power

Luffy taps into the power of Gear Third whenever he needs to rely on excessive raw power. On the contrary, Gear Second is used when Luffy needs excessive speed, making it different from the third gear of Monkey D. Luffy.  According to Luffy, when he uses Gear Third, his attacks are comparable to those of the Giant race of the One Piece world.

This can be further backed up by the fact that a regular attack from Gear Third send Rob Lucci flying, and was enough to destroy an entire Marine Battleship with ease. Luffy was also capable of destroying the structure of someone as huge as Oars, one of the members of the Ancient Giants of the One Piece world.

5 Luffy's Mastery

After the two-year time-skip, Luffy's control over Gear Third has improved vastly and made him stronger as a result. While using it before the time-skip inflated his entire arm, Luffy is seen being able to control the amount of air and the location at which it gets stored at will. As a result, his mobility isn't affected as much as it once was, and the attacks pack a much bigger punch.

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As mentioned earlier, Luffy doesn't seem to shrink after using Gear Third following the two-year time-skip in the series, which further solidifies the fact that his control over this skill has reached the absolute pinnacle.

4 Gear Third Shield

Although Gear Third is primarily an offensive ability, Luffy has slowly learned to use this power to protect himself from strong blows as well. This was first witnessed during the Dressrosa arc of One Piece in Luffy's short fight against Admiral Fujitora where he took one of the Admiral's attacks head-on and cushioned the blow using Gear Third.

Although this technique hasn't been used much, it shows that Luffy can use it in more than just one way. In the future, the Straw Hat Pirate could further use this ability in ways yet unknown.

3 The Naming

Luffy has a rather clever way of naming his techniques, much like any other member of the Straw Hat Pirates. For Gear Second, Luffy usually uses 'Jet' as a prefix for all the attacks, which indicates that ferocity of the newly created moves. When it comes to Gear Third, Luffy uses 'Gigant' as a prefix, which indicates the new techniques exhibiting powers akin to a giant.

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In the English dub, the 'Gigant' prefix is replaced by its translation of 'Giant'. For instance, Luffy's regular Gomu Gomu no Pistol becomes Gomu Gomu no Gigant Pistol in Gear Third (Gum-Gum Giant Pistol in English).

2 Usage With Haki

Like Gear Second, Luffy's Gear Third can also be enforced with Busoshoku Haki, making it much stronger than it was before the two-year time-skip. When used with Busoshoku Haki, Luffy changes the naming pattern of the attacks and adds the name of mighty beasts, such as 'Elephant', or 'Grizzly'.

For instance, Luffy's Gomu Gomu no Gigant Pistol, when used with Haki, becomes Gomu Gomu no Elephant Gun.  On the other hand, Luffy's Gomu Gomu no Bazooka, when enforced with Haki, becomes Gomu Gomu no Grizzly Magnum.

1 Electricity Generation

Akin to Luffy generating fire in Gear Second to use Gomu Gomu no Red Hawk, Gear Third sees him generate an electricity discharge instead. This has only been seen once in the story so far when Luffy clashed against the 12th Leader of the Happo Navy, Don Chinjao at the Corrida Coliseum in Dressrosa.

Upon using a technique known as Gomu Gomu no Thor Elephant Gun, Luffy's punch is seen producing electricity when making contact with Don Chinjao's head. Interestingly, this attack is also named after Thor, one of the Gods of the Norse mythology.

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