What are the strongest summons?

[Bowlingballhead]

I am amused. Clearly, you people's games go MUCH longer than mine do. No doubt because I'm playing with only one other person at a time, and we're at each other's throats so quickly.

But to my question. R'lyeh. I love R'lyeh. Not for their power, which is decent, but for their style. A man has to go with style. And what's the coolest thing they've got? Well, of course, horrible otherworldly things summoned from the Void Gate!

So does anyone know how to get the best out of the Void Gate? Is it sensitive to higher-level mages? Is there any way to restore a feebleminded mage's magic so that he can go back to summoning? I've gotten a few nifty things out of the Gate, but they've all been pretty weak so far. I want to see what it can really do.