So'unga

Name: Sō’unga (叢雲牙, "Amassing Cloud Fang")
Appearance:
Backstory:

Quote :

Sō’unga (叢雲牙, "Amassing Cloud Fang") is a demon sword. It is the opposite of Sesshōmaru's inherited sword, Tenseiga, "the sword of life or heaven," as Sō'unga is considered "the sword of death or hell."
Sō’unga, "the sword of hell or of world conquest," can summon 100 dead souls in one swing. The combined powers of the Tessaiga and the Tenseiga are the only swords capable of defeating Sō’unga, which was stronger than either of the two swords alone
Sō’unga, unlike the Tessaiga or Tenseiga, was not created by Tōtōsai from the Inu no Taishō's fang and it is unknown how Inuyasha's father came to possess it. Also, unlike the other two, Sō’unga contains the spirit of an ancient evil dragon from the depths of hell. When held by a human, Sō’unga takes control of them, and they will kill everything they possibly can, and when held by a yōkai, Sō’unga will try to persuade them to do its bidding. However, if the yōkai is strong enough, they can overpower Sō’unga with their own will and control the sword on their own. One such demon was Inuyasha's father, who said it was an act of weakness if he let what he should be controlling take control of him. He used the sword to fight Takemaru of Setsuna as a flaming mansion collapsed and killed them both.
Afterwards  
The seal that holds Sō'unga.
, the Inu no Taishō's servants Myōga, Tōtōsai and Saya pondered on what to do with Sō’unga, after disposing of the Tessaiga and Tenseiga. They couldn't give it to Inuyasha, as he was merely a baby at the time and neither Sesshōmaru, who desired power and would kill them for being given Tenseiga. Saya suggested he'd hold the sword off quietly for seven hundred years, placing it in the Bone Eater's Well.
During the story Edit
However, about 200 years later, the sword ended up in Kagome's family possession. In the 21st century, the seal became broken. Therefore, Saya tried finding Inuyasha, in hopes that he would be able to control Sō’unga before it could unleashed chaos in the modern world.
When Inuyasha grasped Sō’unga, he was taken over, but regained control for a short period of time. To prevent it from harming anyone in the future, Inuyasha went into the past, where it began a reign of blood. It battled Sesshōmaru, knowing all of his thoughts when their swords clash. Kagome managed to release Sō’unga from Inuyasha's arm using the prayer beads, causing the sword to fly off.

Self-reliant Sō'unga
• Picked up by an undead ogre it had previously slain, Sō’unga went into the netherworld, retrieving Sesshōmaru's left arm that was cut off by Inuyasha during their battle (Episode 7 of the series) and then came upon the burial site of Takemaru, resurrecting him, giving him the arm so he could use the Dragon Twister and a chance for revenge on the Inu no Taishō's sons. Grasping the sword, Takemaru gained a demonic appearance and slaughtered an entire castle full of soldiers to resurrect as the living dead. Sō’unga's spirit guided Takemaru, as Inuyasha and Sesshōmaru's groups came upon the castle. Capturing Kagome and Rin, Takemaru tried to strike, but Sesshōmaru's intervention stopped it. Sesshōmaru tried to kill Takemaru with Tenseiga but he was resurrected. However, when faced by Inuyasha, whose desire to protect Kagome filled him with power, Takemaru was back. Realizing that his love, Izayoi wanted him to live back then, Takemaru finds peace and leaves the world of the living. Sō’unga, however, wasn't finished yet and constructed a body for itself to fight, opening a portal to the Netherworld that would encompass the living world. Sō’unga fought against Inuyasha and Sesshōmaru, who battled it individually, weakening it with Tenseiga and Tessaiga's combined presence but unable to defeat it. However, they eventually combined their Backlash Wave and Dragon Strike techniques to destroy Sō’unga's body and eradicate the demonic spirit, sending it into the netherworld, where it couldn't harm anyone.

Health: S
Sharpness: S
Special Abilities: Dragon Twister (獄龍破, Gokuryūha; lit. Hell/Prison Dragon Blast):

Spoiler:

(If They are out of their Sheaths, the Stats for this is only B and only goes out 10 meters, if they are in their sheaths, then this move's stats are at SS a piece and goes out for 50 meters, Duration is 3 posts, cooldown is 5 posts, costs B rank)

• Sheath of Sō’unga:

Spoiler:

(Shield summoned at reaction time of user, at S health, distance of three meters around the wielder of the sheath, Cooldown is 3 posts, duration is 1 post, costs B rank)

• Reanimation:

Spoiler:

(Can only Revive if the body has been dead for Less then three days in real life time, and its only at half stats, and acts as another person for the rper to play as, they have a Regen ability, or can disintigate into Miasma, the Misama will damge the health of any not immune to it for E-rank, without antidote its perminate and miasma lasts till blown away, and will deteriate the health for E-rank per post, Miasma spreads out for five meters in diameter away from the body)(As long as bodies still meet the requirements, they may use the jutsu they knew when they were alive, allowed to have revived a Maximum of 10 people, must have been Player characters, can not learn jutsu, can not Gain stats from training, Items abilities are a differnet story)

• Black Spikes:

Spoiler:

(Fires as many as the user as chakra (Ie S Chakra-100 Spikes), each spike being S in each stat, reaching 20 meters, Cooldown is 2 posts, duration is 1 post, costs C rank cp)

• Path to Hell:

Spoiler:

(Opens a Portal that can Destory up to 300 meters, dealing SS damage to everything in sight, Health of the Portal is SS, speed at which is destroys is A costs S to use, Once a topic/All topic long or until destoryed)(wielder of blade is immune)

• Phantom Castle:

Spoiler:

(basically a Genjutsu of the highest power, can only fool those with a chakra equal to or higher then the user's(maxed at S)

• Self-sustaining body:

Spoiler:

(will reanimate the body of the weilder and attach itself to it for 5 posts, no abitlies or jutsu may be used, pure stats alone)

http://inuyasha.wikia.com/wiki/S%C5%8D%27unga.

Price: Event
Character Specific: If the weapon is specific to a character, if so put their name here.
Bonus Requirements: Must Fight Inu No Taisho

So, Im on a mobile device, and cant tackle everything right away, but right off the bat:
Path to Hell needs a cooldown.
Sheath Shield thingy needs an CP cost?
Black spikes have no CP cost... or cooldown.

Edited

"Reanimation": Do the miasma-corpses have use of jutsu?
You mention that the portal to hell can be destroyed: does it have a corresponding health stat?

Yes it says 300 in each stat, and the reanimated are allowed to use jutsu they knew in a past life, as long as they still meets its requirements

Edited