Is the Tarrasque a Lesser Servitor?

[Havard]

Your scheme doesn't look bad at all to me!!!
I don't think a Tarrasque is too powerful as it measures up agaist Demigods... and if the Egg of Coot is a Greater Servitor, the Tarrasque can well be a Lesser one...

Probably true, though it would be in the top range of the lesser servitors.

It has just to be explained why the Outer Beings can't access "this" reality and the Immortals can't access "that" reality, while Servitors can exist in "this" reality (and probably, for balancing reasons, Exalted and Demigods can exist in "that" reality as well)... Did they get "stuck" in the "wrong" reality when the Older Ones "split" the realities between Immortals and Outer Beings?

I believe fan material on the subject details a war between the Immortals and the Outer Beings at the Dawn of the Multiverse, resulting in the Outer Beings being banned beyond the Vortex Dimension.

The Servitors were created in the Nightmare Dimension, specifically to be able to give the OB's some kind of influence in our Multiverse.

-Havard