You watch your viddss!?

I wouldn't trust any NPC who claims to know how to beat an entire dungeon. Where'd he get his information? If he knows what the big bads do and how to beat them, why am I stuck doing the heavy lifting? "We know this is how you beat this guy. I mean, none of us have been able to, but you should totally listen to me anyway."

I could maybe suspend disbelief for one or two dungeons. Maybe someone snuck through and saw how people died. Or has collected ancient legends or whatever. But for every dungeon? No, sorry. Don't buy it.