Tōkijin

is a great sword forged from the fangs of Goshinki, the third reincarnation of Naraku, which was both commissioned to be forged and subsequently wielded by Sesshomaru.

History
Sesshomaru abandoned his quest to obtain Tessaiga, but instead searched for a sword that could rival it. He discovered the remains of Naraku's incarnation Goshinki, who was able to break Tessaiga with its own fangs. Sesshomaru, having discovered this, decided that the fangs would produce a powerful sword that could rival the Tessaiga. He requested that the swordsmith Kaijinbo (a former apprentice of Totosai, but was expelled for creating too many evil swords) create a sword from Goshinki's fangs. At first, Kaijinbo refused because he could not create a great sword from a dead yokai, but Sesshomaru revived him with the Tenseiga, at which point Kaijinbo gladly accepted his request.

Upon the completion, Tokijin possessed Kaijinbo and he killed Jaken who was checking on the sword's progress. Goshinki's hatred for Inuyasha was so great that the Tokijin also bore the hatred, and Tokijin forced Kaijinbo to go after Inuyasha. Kaijinbo was not strong enough to bare Tokijin's great power, so when he battled InuYasha who wielded Tessaiga his body was destroyed by the pressure of the two blades. Sesshomaru (who revived Jaken and to discover what happened to the sword) found the Tokijin and claimed it, defeating the evil aura that possessed Kaijinbo. Sesshomaru used Tokijin to test the sword and discover the change in Inuyasha's blood. Tokijin was able to match Tessaiga in power and gave Sesshomaru the advantage in the battle (The reforged Tessaiga too heavy for Inuyasha to wield). The battle ended when Inuyasha transformed into a full yokai and his friends escaped with him, while Totosai distracted Sesshomaru.

Signature Weapon
After the battle Tokijin became Sesshomaru's signature weapon. Over time Sesshomaru's mastery of the sword revealed the true power of the sword. Originally Tokijin fired needle Kenatsu that cut the enemy without the blade actually touching them. Tokijin developed a stronger Kenatsu that released a powerful energy wave made of yoki; the attack is similar to the Kaze no Kizu. In the InuYasha movies series Sesshomaru can channel a large amount of his yoki into the Tokijin to release the Souryuuha which rivals the Bakuryūha.

Because Tokijin was forged from the fangs of a oni it limits the amount of yoki Sesshomaru can release. After the Souryuuha is used Tokijin cannot be used until it recharges. As Tessaiga and Tenseiga being forged from a daiyokai's fangs they do not have this limit.

Destruction and Replacement
When Sesshomaru battles Moryomaru for a second time he insults Kagura in front of Sesshomaru, which angers him. Sesshomaru unleashes the most powerful yoki wave ever produced by the Tokijin which damages Moryomaru's shoulder armor and shatters his arm. He pushes the Tokijin into Moryomaru's armor and cracks it, but the stress applied to Tokijin breaks the sword.

Sesshomaru refuses to get Tokijin repaired because it did not have the power to defeat Moryomaru and instead finds a replacement sword, which he eventually found when Totosei reforged Tenseiga into a weapon with a offensive new technique

General appearance
Unlike most other weapons in the series, Tokijin resembles a long hilt Indian Khanda ( Basket hilted two-handed Khanda ), a double-edged straight sword which is wider at tip and narrower at base , being the only sword with this type of blade in the world , inspired from the representation of Acalanath Vidyaraja or Fudo Myo o ( Fudo myo o ) , the buddhist fierce god of protection who weilds the Vajra Khadga also known as Kongo-ken or Thunder-sword (see wikipedia artlcle Acala). It has a yellow cross guard, red hilt and yellow round pommel with a red thread tied to it.

Powers and Abilities

 * Aura: When wielded by Kaijinbo, the sword constantly emits an intensely evil aura, so much that it ends up consuming its own creator, Kaijinbo, body and all. The aura itself was so sinister that other demons were unable to go even near it, until it is succumbed by Sesshomaru. It is a pale reddish energy aura in color.
 * Kenatsu: This ability allowed the tokijin to slash enemies without direct contact. Initially, Toukijin fired needles of kenatsu which could dispose of many yokai, but Sesshomaru later develops a stronger kenatsu, composed of a massive wave of blue yoki, similar to the Wind Scar. Later, Sesshomaru developed a second kenatsu that fired a massive sphere of green-blue energy.
 * Tokijin's strongest and most powerful only named attack. When Sesshomaru charges yokai into the Tokijin and then releases as massive amount of youkai in the form of light blue glowing blue arcs of lightning. In the fourth movie, the Souryuuha became stronger and manifested in the form of a light blue lighting-like dragon made of pure energy. The "Dragon Strike" is at first shown to be equal in power to the Bakuryuuha but when Sesshomaru channeled his anger into the Tokijin to strengthen and enhance the attack even further, it eventually overpowered the Backlash Wave. Only featured within the movies and anime.
 * Energy Slash: In some of the Inuyasha video games Sesshoumaru appears in, Toukijin is able to emit an unknown surge of sharded energy, similar to the graphics of Inuyasha's Kongōsōha and is a variation of its kenatsu ability. There are times where yellow lightning seems to acompany it.