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|Use||Weapons of the Alchemist Warriors|
|Created By||Unknown alchemists|
|Used By||Alchemist Warriors|
|Debut||Chapter 1 (Manga)|
Episode 1 (Anime)
Buso Renkin (武装錬金 Busō Renkin, Japanese for "Arms Alchemy") Buso Renkin are alchemical weapons formed by the Kakugane, based on the user's will to fight. Buso Renkin are the only weapons known to be able to kill a Homunculus.
Responding to the user's fighting spirit a Kakugane disassembles and reassembles into a unique shape based on the user's personality and fighting style. This means that they can only be used by humans or human-type Homunculi, since only humans have the instinct to use tools to defend themselves. Buso Renkin commonly take the form of metallic weaponry such as a lance or death scythe but it is also possible for the Kakugane to form more unusual items such as a submarine, an underground passageway or even a sentient mechanized doll.
The form a Buso Renkin can take is completely unique depending on the user as no two Buso Renkin are the same, even the same Buso Renkin formed using a Kakugane with a different serial number has some cosmetic differences which is often known as an Alternate Type. A Buso Renkin will not activate if the user is exhausted, heavily injured or otherwise unable to fight as it dampens their fighting spirit which fuels the Buso Renkin, in the case of Tokiko Tsumura a parasitic Homunculus core inside the user can also effect the chances of a Buso Renkin being activated.
Sharing the same origin as the Kakugane, the Buso Renkin were the result of weaponry development within the Alchemist Army and as a counter to the monstrous Homunculi. Like the Homunculi however they proved to be too dangerous and were kept secret from the public.
Double Buso RenkinEdit
It is possible for more than one Kakugane to be used as a Buso Renkin by a single person. The Buso Renkin formed are both the same weapon, however they will look different, usually with one being an Alternate Type. While having two Buso Renkin boasts more power, there are many drawbacks as the weapons can become heavily unstable if the user is not experienced in the use of multiple Buso Renkin, as such only an experienced Alchemist Warrior like Captain Bravo can use them efficiently.
Known Buso RenkinEdit
|Sunlight Heart||Buso Renkin of the Lance||Black Kakugane III (3)||Kazuki Muto|
|Sunlight Heart Plus||Buso Renkin of the Lance||Black Kakugane III (3)||Kazuki Muto|
|Sunlight Heart: Alternate Type||Buso Renkin of the Double Lance||XLIV (44)||Kazuki Muto|
|Valkyrie Skirt||Buso Renkin of the Death-Scythe||XLIV (44)||Tokiko Tsumura|
|Silver Skin||Buso Renkin of the Metal Jacket||C (100)||Captain Bravo|
|Silver Skin: Alternate Type||Buso Renkin of the Double Metal Jacket||LII (52)||Captain Bravo|
|Near-Death Happiness||Buso Renkin of the Black Powder||LXI (61)||Papillon|
|Sword Samurai X||Buso Renkin of Japanese Blade||XXIII (23)||Shusui Hayasaka|
|Angel Gozen||Buso Renkin of Archery||XXII (22), LXX (70)||Ouka Hayasaka|
|Peaky Gulliver||Buso Renkin of the Right Hand Gauntlet||LII (52)||Kinjo|
|Noisy Hamelin||Buso Renkin of the Steel Whip||LXI (61)||Jinnai|
|Satellite 30||Buso Renkin of the Moon Fang||XXX (30)||Moonface|
|Alice in Wonderland||Buso Renkin of the Chaff||LXX (70)||Dr. Butterfly|
|Fatal Attraction||Buso Renkin of the Great Axe||Black Kakugane I (1)||Victor Powered|
|Motor Gears||Buso Renkin of Chakrams||LV (55)||Gota Nakamura|
|Blaze of Glory||Buso Renkin of the Napalm||XX (20)||Sekima Hiwatari|
|Gekisen||Buso Renkin of the Cross Spear||XII (12)||Genji Ikusabe|
|Secret Trail||Buso Renkin of the Ninja Sword||XIV (14)||Shinobu Negoro|
|Bubble Cage||Buso Renkin of Floating Mine||XXXII (32)||Madoka Maruyama|
|Killer Rabies||Buso Renkin of Military Dog||XCII (92)||Rintaro Inukai|
|Hermes Drive||Buso Renkin of Radar||XCV (95)||Chitose Tateyama|
|Aerial Operator||Buso Renkin of the Gas Mask||XXXIX (39)||Hanaka Busujima|
|Buster Baron||Buso Renkin of the Full Plate Armor||XVII (17)||Shosei Sakaguchi|
|Deep Breathing (Part 1)||Buso Renkin of the Submarine||LXXVII (77)||The Captain|
|Deep Breathing (Part 2)||Buso Renkin of the Submarine||LXXVIII (78)||Unnamed Crew Member|
|Deep Breathing (Part 3)||Buso Renkin of the Submarine||LXXIX (79)||Unnamed Crew Member|
|Genocide Circus||Buso Renkin of the Missile Launcher||LXVI||Unnamed Alchemist Warrior|
|Alchemy-Powered Laboratory||Buso Renkin of the Laboratory||XI||Unnamed Alchemist Warrior|
|Rurio Head||Buso Renkin of the Helmet||L (50)||Alexandria Powered|
|Underground Searchlight||Buso Renkin of the Secret Path||LI (51)||Victoria Powered|
|Lightning Pale Rider||Buso Renkin of the Spear||LXXIV (74)||Soya Muto|