When Wendy found the writings of his uncle William, she was fascinated by what was written there: it was narrated of a new, secret, mystery science, of a prehuman civilization disappeared in the mists of time, collapsed at the hands of his own devices, destroyed by the blind and idiotic use of otherworldly powers.
Wendy didn't really know when she decided to revive that science, but if there was even a way to reunite with Abigail, that was the way. 
"I learned untold knowledge..." Edit: "Once my intellect was extraordinary: I could grasp what was between this and other worlds, still feel the psyche of my twin, gather a bit of cosmic truth.
Now I am a poor idiot, unable perhaps to count to ten.
I was pardoned from the curse of intelligence" For other skin concept art on Wendy:  
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