Sometimes you just need to command the damned Tarrasque [3.5 PrC, PEACH]

[Morph Bark]

First: A couple of things

1. This will become a PrC. I've slept on it and discussed it, this works better as a PrC, rather than a base class.

For a PrC, I think you should lower the level 10 amount of HD in creatures you can control. 200 is a lot and you could get a small band of high-HD, high-CR creatures with that. Therefore, make sure you have CR/HD limitations per creature too.