These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Cohen and the Horde are foreign ghosts: they can walk through walls! (This is pretty much explicitly stated throughout the book, but it's a good encapsulation of the culture shock that everyone experiences when the Barbarians and the Great Wizard come to the Empire.)
Faced with five armies and a butterfly-conjured storm, Cohen finds himself wishing there'd been at least one god whose temple he hadn't sacked in his long career. Unbeknownst to him, there is one: the Lady, whose side he's unwittingly fighting for in the game of Mighty Empires, and who doesn't have any temples.