I took a look to the list of proposed creatures, and I did not find the astral dragon (from Krynn monster compendium, 2nd edition):
http://www.lomion.de/cmm/dragastr.php
Just an hypotesis:
The MitD is an unmated astral dragon:
- It's immortal (no way to harm him with weapons)
- It's ugly and beautiful (as most dragons, from a "commoner" point of view)
- His father is REALLY big (length of 50 feet)
- He needs just liquids to not starve, but he can eat whatever he wants (maybe he likes stew so much since it's semi-liquid)
- He's a children (he will remain a children until he will find a proper mate)
... but somewhat he has a spark of the powers of the mated ones (35th-level clerics).
This *could* explain the earthquake and escape scene - these powers are latent, he did not know about them, and he used them without knowing what he was doing.
Just my 2 cents