A decent post, but more could be done with the idea.
What keeps someone else from learning the command word and summoning the keys? Do they need to be kept for a certain length of time (to "attune" to the owner, perhaps) before they will work? Go to Comment
An interesting idea, though these boots tickle the back of my brain like I should know they are from somewhere else (Castlevania perhaps? or Trinity Blood?). The initial use as a quick sell to religious types giving over to the religious types making them themselves is a nice touch. All in all, short but good work. Go to Comment
Real World: some Indians in the Amazon treat their eyes with a traditional potion applied with palm leaves. Brutally painful, the drug alters vision, giving the jungle's dense green walls greater texture and dimension. You could adapt this to desert or swamps, or other hard to navigate regions.