Here was the part that twisted Verity's stomach in knots. All this work to get him to trust her and- no- she couldn't promise him a damn thing. Better to act certain or humble? Damn...
"It's not been done here," she admitted. "But I believe I do. Ultimately, it's just a matter of summoning. But living things may resist a summoning, so it won't necessarily be easy."
There! That sounded confident and competent and not at all like she was practicing the art of fake-it-til-you-make-it.