No. You might be able to achieve a similar effect if/once you learn magic. But right now you can't do it.
There are, but you haven't encountered them, nor will you be able to use any magical abilities they might possess (including fire breath).
However, if you do want to attack somewhere as a monster you can, but it will have to rely on brute force and not a creature with magical abilities (You can transform into a minotaur, an ogre, a dire wolf and most humanoids and animals. I'm fine with you transforming into another relatively common monster, just ask me if you think of a form you want to transform into.)
Drat. Worth a shot.
Ooh!
What about a wyvern?
Or, wait, even better idea:
[x] Assault the mine.
-[x] Approach it in the form of a bird, then alight somewhere relatively nearby, and change unseen into the form of a small emaciated girl-child, with long, tangled black hair, dirty and bedraggled hair, and a faintly unsettling cast to her features.
--[X] Stumble, seemingly dazed, towards the buildings surrounding the mines, until someone approaches you. Tell them in a weak voice, that you are so hungry, and have not eaten human food in
so long.
---[X] If someone offers you food, or otherwise at some appropriate, amusing or necessary juncture, turn into as enormous a wolf-creature as you can, and tear them apart, giggling in a high-pitched fashion all the while.
That will keep 'em guessing.
Clearly we need to find a wizard bunny.
Anyway, first things first, treasure.
What we need is a miniature giant space hamster.
It'll all come right if we get a miniature giant space hamster.
] Disguise yourself as a cute bunnycat.
