Like the Rikti! Oh, the possibilities!
Magic alien invasions... possibilities endless...
I've started many campaigns with magic alien invasions (well, psionic aliens, but still), but never thought to do so by dropping an alien golem on the PCs location. Maybe make some CR5 things like this (which I think I'm going to go do now, with a link to attribute them to VT). If you were using one of these guys as the prelude to an alien invasion, i could see that working for an epic campaign, though I'd /HATE/ to meet the aliens that could drop these things. *shudder*
Mr. Tribble, thank you for the awesome creature and idea.