Thunder Grass?

The Vermillion Bird was about 50 feet long. It had the head of a pheasant and a long scarlet neck like a snake. Its body was covered in feathers, and burning flames shrouded it. As it flew, it shed sparkling red lights that sprinkled down onto the world. It was beautiful, like an exquisite dream.

Although he was far away, Sam could still feel the Vermillion Bird emitting a vast pressure that made his heart skip.

Under the suppressive nature of this aura, Sam's speed dropped. He glanced backward at the little flame boy to see if he had caught up. However, he hadn't expected the little flame boy to be even worse. It had stopped and was staring at the flying Vermillion Bird with both eyes. Fear filled its face.

Sam paused. Mm? Was it afraid?

At this moment, the Vermillion Bird bowed its head downwards, overlooking the little flame boy. The little flame boy was scared out of his wits. It gave a miserable scream before turning tail and running!