Tekkei

Tekkei is a huge demon bird literally the size of a mountain who was mother of Princess Abi and queen of the phoenix demon hordes.She was also part of a group of demons of the netherworld.Before abi was introduced in the story she ate a poisonous demon that made her ill causing her to stay resting inside of her bird demons nest inside a mountain and only had a hole in the mountain for her eye to communicate with the outside world.Her daughter princess abi used there bird armies to bring blood for Tekkei to drink to dilute the poison by draining village after village of blood.Later Naraku said he would help them in their quest to cure Tekkei which the accepted but it truly was so that he could kill Tekkei.They had their suspisions and planned on betraying Naraku.When Tekkei finally healed she revealed her self to be a gigantic bird the size of a mountain and proceded to attack Naraku along with Abi and swallowed him.Then Inuyasha's gang attacked them and they started to fight but suddenely Naraku burst out of Tekkei's head revealing to be alive and then killed both Tekkei and Abi and used tekkei's blood to go to the netherworld.

Powers and Abilities :

Fire manipulation:She is able to breath fire in both the manga and anime and in the anime only showed the ability to shoot fire balls from all over her body.