Lambert was otherwise just going to use it to turn into a dragon, and he doesn't really have much use for that now. Complicated magic, things that could protect the Carnival in a more lasting way... he doesn't have much of that. All he can do is find people he trusts to carry that out.

"Right," he affirms, already looking halfway to drifting off again, settling against the pillows. "And keep working ... on what we got from the books. We need to find our next stop."