[D&D 3.5] The Emerald Legion-Mass Producing Ikea Tarrasques

[Altima]

...lets focus on trying to make them invincible first, and worry about losing control later.

Famous last words...

As for someone else sending a 'perfect' legion towards you, your flawed units should have the numerical advantage. Defensively (unless the new legion can fling around supernatural death effects), they'll be equal, so you can tie up the new guys with your old guys then smack the youngsters with the rest of your forces.

Also, does the illithiid void mind control scheme work across planes?