Boosted Gear
Boosted Gear
Issei Hyoudou's Boosted Gear (Dragon Booster form)
Kana 赤龍帝の籠手ブーステッド・ギア
Romaji Būsuteddo Gia
Other Names The Red Dragon Emperor's Gauntlet
Type Sacred Gear (Mid-Tier Longinus)
Forms Gauntlet
Scale Mail
Juggernaut Drive (Formerly)
Illegal Move Triaina
Cardinal Crimson Promotion
Diabolos Dragon God
Abilities • Doubles the wielder's power every 10 seconds
• Transfers increased power to other people or items
• Penetrates through defensive barriers
Wielder(s) Belzard (Former Wielder)
Elsha (Former Wielder)
Issei Hyoudou (Current Wielder)
Euclid Lucifuge (Replica) (Former Wielder)

Boosted Gear, also known as the Red Dragon Emperor's Gauntlet, is a Sacred Gear wielded by Issei Hyoudou. Listed as one of the thirteen Longinus, it has the spirit of the Welsh Dragon, Ddraig, residing within it.


In the past, Ddraig fought against his arch-rival, the Vanishing Dragon, Albion, in a battle that was interrupted by the Angel's, Devil's, and Fallen Angel's who were at war during the time. In anger, both Dragons attacked the leaders of the Three Factions, which led to their bodies being destroyed and their souls being sealed into two separate Sacred Gear's, with Ddraig moving into the "Boosted Gear", a Sacred Gear that eventually became one of the thirteen varieties of Longinus.

In Volume 9 of the Light Novels, it is revealed that when a host of the Boosted Gear dies, a fragment of their consciousness is stored inside the Boosted Gear normally only waking up during the activation of the Juggernaut Drive. However, there are two people who maintain a degree of consciousness; Belzard and Elsha. Belzard is known as the strongest Boosted Gear possessor for defeating two White Dragon Emperors in his lifetime, while Elsha is known as the second strongest and the strongest female.

In Volume 10, it is revealed that a past possessor of Divine Dividing was stored within the Boosted Gear when Issei used one of Albion's jewels to create the Dividing Gear. The past possessor of the Divine Dividing then used his halving power to diminish the dark thoughts of the Boosted Gear's past possessors, allowing Issei to awaken a power opposite to Juggernaut Drive: Cardinal Crimson Promotion, with a different chant.

In Volume 12, all the past possessors sacrificed themselves in order to save Issei's soul from Samael's curse.

In Volume 16Euclid Lucifuge reveals that he created a replica version of the Boosted Gear by collecting information of the Sekiryuutei's soul and the Sacred Gear from Issei's original body that was left in the Dimensional Gap by using the Holy Grail. Unlike the original Boosted Gear however, the Boosted Gear Replica appears on the user's right hand with silver lining and uses the souls of famous Dragons to activate it. In the following Volume, the replica was destroyed after Euclid's defeat against Issei.

In Volume 18 Issei and Ddraig unlocked one of Ddraig's original powers called Penetrate that allows Issei to bypass defensive powers, such as Rizevim's Sacred Gear canceler.

In Volume 20, Issei uses a new chant that he and Ophis chant, alternating lines, that allows him to temporarily borrow Ophis' power of infinity. Ddraig names the new form Diabolos Dragon or DxD.


Boosted Gear takes the appearance of a a red gauntlet with a green jewel and 2 golden spikes that manifests on the user's arm. In the anime, it's initial state looks like a regular Twice Critical. After a certain time, it transforms into a more Dragon-like gauntlet that covers up the user's hand and a majority of the arm. When the Boosted Gear reaches it's second liberation, it gains another green jewel and a total of 10 golden spikes, once again covers up more of the user's arm.


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Issei activating "Explosion"

The Boosted Gear has the ability to Boost which can double the user's physical and magical power every 10 seconds. With further changes in response to the user's feelings, the Boosted Gear can transform into the Boosted Gear Gift, which has the ability to Transfer the increased power to other people or objects. The transfered power can be performed on multiple people/objects at the same time, however, this decreases the efficiency, and some of the power will be lost in the transfer. This can also be used on a certain part of the user's body such as the eye's for enhanced vision.

In Volume 3, Boosted Gear gains the ability to determine an opponent's power level and tells Issei when his boost has built up sufficient power to possibly defeat an opponent, either by utilizing it himself or transferring it to an ally. However, this ability has not been used since the fight with Kokabiel.

In Volume 4, the Boosted Gear has also been shown to be able to store powered weapons and items within it and allowing the user to wield their capabilities, such as the Holy Sword Ascalon (after some adjustments) and a jewel from Divine Dividing's Scale Mail. Storing the item is all dependent on the user's will

In Volume 18, Ddraig unlocked the power of Penetrate, this allows the user's attacks to hit, even through powerful defensive barriers. Issei soon adapted the ability to grant him the power to see through solid objects (i.e Clothing) at will.

In Volume 21, Issei unlocked the strongest of Ddraig's original powers, called Blazing Inferno of Fiery Flame.


With Ddraig sealed within the Boosted Gear, its possessors become vulnerable to Dragon-slaying magics, swords and curses as if they themselves were Dragons. Also, continuous use of the Boosted Gear will drain the wielder's stamina to a significant degree.


  • Dragon Booster: Summons the Boosted Gear.
  • Boost: Doubles the user's power. This call is announced every 10 seconds until the user reaches his/her physical limit. In Balance Breaker mode, this call is announced repeatedly until the user reaches his/her limit.
  • Explosion: Releases the Boosted Gear's stored power for a short period of time.
  • Reset: This announcement is called after all the Boosted Gear's stored power during Explosion is drained. Once called, the user cannot use Boost again for a certain period of time, so long as his body is not near its physical limits.
  • Burst: This announcement is called when the Boosted Gear's wielder reaches his/her physical limit. Once called, all of the user's increased powers are drained.
  • Dragon Booster Second Liberation: Changes the Boosted Gear into the Boosted Gear Gift. This announcement was used only once during the Rating Game between Rias and Riser.
  • Transfer: Transfers increased power to other people or objects.
  • Welsh Dragon Over Booster/Welsh Dragon Balance Breaker: Activates the Scale Mail armor, Boosted Gear Scale Mail. The first call was used in Issei's final showdown against Riser when he used an incomplete Scale Mail, while the second (and subsequent) call was first used during Issei's battle with Kuroka where he had attained his complete Balance Breaker.
  • Vanishing Dragon Power is Taken: This call was announced when Issei formed the Dividing Gear with one of Albion's jewels during his battle with Vali.
  • Divide: Halves the opponent's power. This call is announced every 10 seconds when the Dividing Gear is in use. In Juggernaut Drive, this call can be announced repeatedly.
  • Blade: Summons Ascalon.
  • Juggernaut Drive: Activates Juggernaut Drive.
  • Longinus Smasher: The chest armor of the Scale Mail slides open and fire a powerful shot. This attack was used only thrice in the series: in Volume 6 when Issei blasted Shalba Beelzebub while in Juggernaut Drive, in Volume 12 when it is used to completely blast away the last of the Jabberwocky, where Ddraig reveals that this is a forbidden and sealed attack, and in Volume 17 where, with the help of his Dividing Wyvern Fairy's boosting power, he was able to achieve it.
  • Jet: Allows Issei to fly with his Dragon Wings while in Scale Mail mode. Accessed after Issei entered Juggernaut Drive.
  • Change Star Sonic: Used in Illegal Move Triaina. Changes the Scale Mail armor into the Welsh Sonic Boost Knight.
  • Change Solid Impact: Used in Illegal Move Triaina. Changes the Scale Mail into the Welsh Dragonic Rook.
  • Change Fang Blast: Used in Illegal Move Triaina. Changes the Scale Mail into the Welsh Blaster Bishop.
  • Cardinal Crimson Full Drive: Activates Cardinal Crimson Promotion.
  • Bust: Announced whenever Issei touches Rias' breasts. This replenishes Issei's power and stamina, albeit at the cost of Rias' breasts shrinking with each use (though they do grow back to normal within a day's rest, according to Rias). This announcement is called repeatedly.
  • Star Sonic Booster: Used while in Cardinal Crimson Promotion. Grants the user godlike speed that far surpasses Welsh Sonic Boost Knight's.
  • Solid Impact Booster: Used while in Cardinal Crimson Promotion. Morphs one of Cardinal Crimson Promotion's fists into one of the Welsh Dragonic Rook's, allowing for an enhanced version of Solid Impact.
  • Fang Blast Booster: Used while in Cardinal Crimson Promotion. Fires the Crimson Blaster, an enhanced version of Welsh Blaster Bishop's "Dragon Blaster". 
  • Reflect: It's one of the two abilities of Dividing Wyvern Fairy and the original power of Albion. The white dragons can reflect any incoming attack to a certain degree. It was first used against Euclid Lucifuge.
  • Penetrate: One of Ddraig's original abilities. Allows Issei's attacks to bypass defensive abilities, such as Rizevim Lucifer's Sacred Gear Canceller.
  • Blazing Inferno of Scorching Flames: The ultimate flames which can incinerate anything and can probably burn the soul, until nothing remains. Once ignited, they will never go out. Even Gods will be burnt to ashes within these flames. It was sealed by God in the Bible. It was only ineffective against Albion. However Ddraig mentioned it may also be ineffective against Great Red or Ophis. It is unlocked in Volume 21 due to the effects of Issei's second Dragon Deification.
  • Dragon Infinity Drive: Activates Diabolos Dragon
  • D ∞ D: Announcement called when Issei is directing Ophis's infinity power



  • In the anime, the Third Form: Boosted Gear Gift had an additional four golden spikes in the upper part of the gauntlet and two on the side of the wrist whereas in the manga, which follows the light novels, the six golden spikes aren't shown.
  • In the anime, using Boosted Gear Gift appears to cause a pleasurable sensation in females whom the "Gift" is given to.
  • Cardinal Crimson Promotion is modeled after the ZGMF-X10A Freedom Gundam from Mobile Suit Gundam SEED. The Diabolos Dragon's Infinity Blaster is very similar to the Freedom's Full Burst attack.
  • In the Afterword of Volume 12, the author stated that Super Gigantic Balance Breaker is a special form for this volume only.
  • Longinus Smasher and Super Gigantic Balance Breaker appear to be homages to the Mega Smasher and Gigantic Exceed of Guyver.
  • In Episode 11 and 12 of the anime's second season, Issei demonstrated the ability of extending the blade far longer than it's normal length, whether this is a normal ability of the sword or an ability gained with the fusion with the Boosted Gear is not clear.


  1. Volume 21

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