Idea on that idea listed above.
Maybe if you want to enter a higher level lair then your tech allows, you can try, but there's a chance, depending on how short in levels you are, that you reach a "bad end"- and die without getting to battle.
Maybe 30% chance if one level short, +20% for each additional level. Maybe per unit.
Maybe with some nice funny messages, like
"A giant pigeon hatofully rips your champion's gizzard out, killing them instantly."
"You found a new interesting species. Unfortunately, it was a grue."
"Dwarves can't swim. Neither can you after falling down into a massive river."
"The species that would eventually become Drengins- well, you're now the reason they enjoy the taste of human skin."
Ok, I suck at these. But if exploration tech represented the ability to traverse hazards/traps, then it makes sense.