http://te4.org/characters/2460/tome/8d6 ... 43f5746775
This was my first solipsist winner. Only died once.
I didn't go AM, as on previous run throughs, I noticed lots of good gear for solipsists that had arcane power. I ended up with 4-5 items arcane powered. So instead I used Dream Forge, and eventually got Core of the Forge mindstar, which helped too. Broken Dreams is awesome.
Ata was easy, only required one psychoportation. I tried to get Inner Demons working on him, but failed

I used talents to reduce his mental saves and cunning, and then bombarded him with mind damage etc. Too easy.
And I had 70% resist all, with Wrath of the Woods and Wild Infusion.
I took Eye of the Tiger, which is brilliant for this build. And Cauterize for Ata, but I didn't even use it once

Edit: I also cleared for armoury worms, room of death, at char level 33. As long as you don't enter the room you can pick them off one or two at a time. You MUST have blind resistance, and inner demons at 5/5.