In the beginning of the series, Ren fights with a kwan dao, a Chinese spear-like weapon. However, as he begins to face more powerful enemies, he switches to the Hou Rai Ken (Bao-Lei), the Tao’s family most treasured heirloom sword. With this sword, he creates a variety of over souls, such as the Bushin. Hou Rai Ken has the special ability of purifying and refining the spirit being integrated into it, making the spirit recall all of its past techniques from when it was still alive. This, in turn, increases the strength of Bason several times making him the ultimate fighting machine as explained by Ren himself in Volume 17 when he was battling Mikihisa Asakura.
In the manga, he becomes one of the Five Elemental Warriors and gains the Spirit of Thunder. His element is reflected in his weapon, the Hou Rai Ken (Jewel Thunder) sword.
Ren’s most powerful attack is called the Vorpal Dance, or Zhong Hua Zhan Wu, in the English manga. The attack is later called the “Golden Vorpal Dance”. The attack is called the Rapid Tempo Assault in the English anime. In the Japanese anime, it’s called Chuuka Zanmai (Chinese Slash Dance) and later on, Golden Chuuka Zanmai. In the manga, this attack results in the spike of Ren’s hair growing outrageously long. In the manga, he is also capable of releasing a strong Armor Oversoul called Bushin Yuchi, roughly translated into Fighting God Fish Fin, and can convert his furyoku into powerful lightning bolts, in an attack known as Raisou(Rule of Thunder)In which a bolt fires directly from his oversoul. He also has two stronger lightning-based attacks known as Kyuten Ougenraisei Fukatenson(The king of Thunder which shakes the core of the Nine Skies)an attack in which he raises his oversoul to the sky and calls down a bolt of thunder right ontop of his opponent and the other is Elec-BANG which is an attack that appears to make a bolt of lightning strike ren’s exact location. This is ren’s fastest attack which he gained theough the desire to gain an attack faster than chocolove’s.
Ja¨ Ensatsu Kokury¨±ha (аÍõÑך¢ü\ýˆ²¨ literally Tyrant-King’s Blaze-Murdering Black-Dragon-Wave).
Black Dragon Hell/Unholy Fire in the English manga.
Black Dragon Wave in the English dub done by U.S. Manga Corps.
Dragon of the Darkness Flame in the English dub done by Funimation.
Black Dragon Spirit Technique in the Filipino dub Version.
This technique involves Hiei creating dragons of fire from demon world using his demon energy to lure the flames to him and then releasing them in the direction of his target/enemy. The dragon cannot be controlled directly once released, however eventually Hiei learns to absorb the dragon once it is stopped and thrown back at him. This puts him in a temporary super state with access to incredible power. As the series progresses, Hiei can use the dragon at will without seriously damaging his arm. It initially crippled his entire right arm the first time he used it, but was later accidentally healed by an enemy’s attack. This is one of the strongest attacks in the YuYu Hakusho universe.
Ja¨ Ensatsu Rengoku Sh¨ (аÍõÑך¢Ÿ’ªz½¹ Tyrant-King’s Blaze-Murdering Purgatory Scorch)
Fist of the Mortal Flames in the English Dub.
Blazing Fist of the Overlord in the English Manga.
Hiei draws the lesser flame of the human world into, one or both, of his fists, and utilizes his lightning speed to create an incredible fire based close range multi-striking attack.
Ja¨ Ensatsu Ken (аÍõÑך¢„‡ Tyrant-King’s Blaze-Murdering Sword)
Sword of the Darkness Flame in the English Dub.
Black Fire Sword in the Filipino Dub.
Hiei lures the darkness flames of spirit world using his demon energy again, but channels them into his sword instead of fully releasing them, making it less dangerous for him and his body (In the Japanese version Hiei creates this attack by merging his yoki with the flames of Demon World and the Dragon is not mentioned at all). Hiei notes his distaste for this particular attack (since it is similar to Kuwabara’s). He eventually learns to create the sword without a channeling point, as Kuwabara does.
I thought it was a good battle.