Whether he knows about what Ardyn did to and caused for Ignis or not, he... can't do it. To himself, or to Prompto; to even go near yet another magic similar to what his ancestor has.

There was only one way to find out, and he would more than likely try once they were more settled and could defend themselves again. Whether he'd mention it to either of them, well.... that one was up for debate.

"We're over water, now. Shouldn't be more than an hour." Where they started from had been the easternmost port of the continent they'd first been taken to when they arrived.