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Cool little dragon.
In the original, it has the ability to force enemies to skip their turns when attacked, which is a terrible trait here; it's exactly what it needs.
But it's not entirely clear where the enchanted armor, crystalline scales, and bear roar come from.
If you're going to give it enchanted armor, then the immunities to weakness and other things are redundant; they won't matter anyway, as it's not vulnerable to anything (except fire wave, chain lightning, hellfire, and pyrokinesis, and whatever else I forgot).
And it could use a bit more HP; in Heroes of Might and Magic III, the average HP is higher than just a 1:1 transfer here.
Added after 10 minutes
By the way, there's another problem: you've given it level 7, so it will be very vulnerable to hero attacks, which will significantly diminish its value.