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Well, if you're sure it's D&D based, then it should be in This List.
If it is not Soulbringer, maybe Nox:
Neverwinter nights Shadow Undertide also sounds like what you're describing, except for the part about the airship. You can have a look at the wild shapes feat of the druid here: You can shapshift into a wolf, and later a dire wolf. Just bear in mind that Neverwinter nights has tons of user created modules, perhaps one of them with an airship in the beginning.
Post edited July 28, 2015 by Matewis