Random Riddle: The Beast - Common Sense Evaluation

It roars like thunder,
And rises higher,
While breathing fire,
This wingless wonder.

If it leaves its cave,
Drags us in its tail,
Over hill and dale,
Then you must be brave.

Early morning flight,
Silently it flies,
Slowly in the skies.
Hides before the night.

My kingdom at least,
To the brave young knight,
If you name it right.

What is this huge beast?

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