I have tried to shrink myself with "Ring of the Ancients" while using the Illusion from "Visage of the Dark Arachnids", and nothing happens. I've tried in different zones, and the same thing applies. Shaman AA shrink does work if you have a shaman or a friend shaman to cast it on you. Someone else using Ring of the Ancients in my group on me, also doesn't do anything.
Polymorph Wand: Steam Suit also is not able to be shrunk by the "Ring of the Ancients". Shaman single target, and group shrink both worked (in the group with the char that needed shrunk).
There is an anniversary task for 'severed spider legs' that is the same illusion, only shrunk... if you wanted to get that now's the time...
Bump. The steam suit on Manger does not shrink with self shrink or shaman shrink. It is unshrinkable.
Shaman AA ability Shrink should work on the non item clicky shrink illusions. IE Aspect of Brood, Visage of Arachnid