Tsukiyomi

Tsukiyomi (月黄泉underworld of the moon) was a human priestess who once hunted demons. At her side as she hunted was a demon, her love, who changed his name to Hoshiyomi because of her and the love he bore her.

Hoshiyomi, in an effort to protect Tsukiyomi from draining herself by using her powers too often, has a demonic weapon created. But the Naginata of Kenkon is too strong, and begins to possess Hoshiyomi. In an effort to save him, Tsukiyomi seals Hoshiyomi away until she can purify the evil weapon. Tsukiyomi successfully separated the Naginata into two swords, the Ken blade and the Kon blade, and hid them, but she dies before she can release Hoshiyomi.

Hoshiyomi is released when a sacred barrier around Mount Hakurai is dispersed, allowing him to find the Kon blade. He seeks the Ken blade, which was held by the Houjou family. Akitoki bears the Ken blade to the Furai Shrine at Shoun Falls where the blade can be purified.

After recombining the two blades back into the Naginata of Kenkon, Hoshiyomi is confronted by the spirit of Tsukiyomi whom he blames for betraying him. She tries to explain what had happened, but Hoshiyomi is too consumed with rage. In the end, Tsukiyomi replenishes Kagome's spiritual power so that she and InuYasha are able to overcome Hoshiyomi and the Naginata of Kenkon.

Abilities
Dispatching Demons: Tsukiyomi was able to dispatch demons with a wide range within her spiritual power, which usually drains a majority of her energy.

Sealing Demons, etc.: Tsukiyomi was able to seal demons and evil with her spiritual immense powers along with star-shaped object but was not able to seal demons and other malicious objects numerous times for the reason that it takes about 75% of her spiritual strength. Thus, Tsukiyomi disinergrates into ashes once she seals the Naginata of Kenkon.

Undoing Spiritual Rituals: Tsukiyomi, as demonstrated by Kagome, was also able to undo spiritual rituals preformed by Hoshiyomi at the shrine. Thus, Hoshiyomi hints that Kagome's spiritual power was able to cope with the ones of Tsukiyomi.

Seperating the Naginata of Kenkon: She was unable to purify the weapon, thus, she was able to successfully seperate the Naginata of Kenkon in Mount Hokurei and Mount Fuji where the Hojo family found and treasured it generation by generation.

Purification: Little is known of her purification skills, but it hinted that she had immense spiritual power to purify only normal demons like the ones she fight day by day, but was unable to purify the ones of the naginata.