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 one of the leader of a rival demon tribe in the area. That particular species turned out to be toxic and she was badly poisoned, forcing her to rest inside of her bird demons' mountain nest with only a hole in the mountain for her to see and communicate with the outside world. Her daughter Princess Abi used their bird armies to bring the blood of countless villagers for Tekkei to drink so as to dilute the poison. Later Naraku said he would help them in their quest to cure Tekkei, which they accepted but only because they intended to kill him themselves afterward. 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 breathing - Tekkei is able to breath fire in both the manga. In the anime, she also showed the ability to shoot fire balls from all over her body.
 * Strength - Tekkei is a very large demon, giving her the brute strength of a creature her size. She is able to move with ease and agility while flying and has shown that she is capable of launching large boulders by flapping her wings.