Castor did not fear the wrath of her dragon, no matter the tone or growl she had set upon him. He had a task at hand, and had greater things to focus on than the trifling dragon. He could tear him apart with ease if he wanted, but at the moment the reptile was lucky. He was too tired to do anything at the moment at least.
"Yes, the heart of the mountain. If I don't retrieve it, all could surely be lost. But....I can't do it alone. the mountain is difficult to navigate, and the Heart is deep inside."