The Littlest Tarrasque wakes from its eons-long slumber and scratches its nose. It’s sooo hungry! It decides to maraud for food.
“Hello there,” says a friendly adventurer while the Littlest Tarrasque is busy marauding at some minnows. “Are you lost?”
The Littlest Tarrasque nods.
“Why not take a nap in this rune-laden adamant chest?”
But it turns out that’s a trap! Those sneaky adventurers! The Littlest Tarrasque giggles, and rends them joint from joint.
Eventually the Littlest Tarrasque rememembers that it eats rocks and burrows deep into the side of Mount Worldspine (there are lots of rocks in there).