When they cross the boundary into Hale territory, Stiles shifts a little in his sleep, shoulders hunching. Lydia's immunity carries over into most of the supernatural world: she can't be bitten, she can't be poisoned, and she's never been able to do magic on her own. Unlike Stiles, she can't feel the veil that separates Beacon Hills from the rest of the world. Sometimes she wonders if what happened before they left would have turned out differently if she'd undergone some transformative alchemy, but usually she tries not to think about it at all.