Because it seems to be such a mass misconception, I shall take the appropriate means to ensure everyone gets the message:
THE ONLY PHYSICAL CHANGE THE INCARNATE GETS IS FROM THE TENTH LEVEL OF SUMMONING
THERE ARE NO OTHER POWER SPIKES OTHER THAN THE TENTH LEVEL
LEVEL TWENTY SUMMONING ISN'T MAGICAL. Just awesome.
*ahem*
As for finding the warp infusion, I cant recall who I got it from, but it comes from a merchant. Just keep looking around. Worse comes to worse you'll get it in Arx (not a spoiler. Butters from Act 1 mentions you meeting her there.)
Sorry for the mass caps, no offense meant to everyone, but I keep seeing that question pop up despite my repeated answers and image proof.
