Maybe something like, 'Found nothing", in reference to those games where you would randomly dig in the ground in hopes of finding something, but most of the time there was nothing
'You're princess is in another castle' - a bit over-done, and technically not an RPG reference, but not a terrible thing either
"You see nothing, hear nothing, smell nothing, taste nothing, feel nothing, and aren't even sure who you are." from the text-based Hitchhiker's Guide to the Galaxy