Let's go vampire hunting

For instance, the sign above the one demon in the panel where he arrives is something I can't read; that probably lead to me not paying close attention to later runes, because I didn't catch a recognizable word in the first one I saw.

Plumber

Anyway I've been ignoring them because it's more fun if we're as ignorant as the protagonist. Why use out of character knowledge when we can fail much more spectacularly without it?