|There are things in the woods. They hate you.|
Beastmen, Satyr, they might look like steroid using goat barbarians but they're flesh eaters and you look like a Sunday roast for the whole warherd.
The Teeth of Beoric, the Green Pearl of Vaxos, the Ivory and Iron Crown, the Skeleton Puppet, finding any of these things can only lead to grief and woe.
Peasants in trouble, faeries have stolen their wagon, an ogre has eaten their children, goblins have soured their milk cow or whatever.
Nothing, they get to the city without incident. Hahaha. As if.
A wizard hunter.
Flying things, pelgrane? Harpies? Dragon? Vores? Moths? Goblins riding moths? The actual Mothman?
Visions, a snow leopard that talks, the Horned Lord and his wolves, any of the other weird faerie-ish gods, a fat man towing a wagon on which sits a huge cauldron of porridge, a black dog with green eyes, a faerie cat, nine dead men hung from the branches of an ash tree.
Witch/witches, inhabiting abandoned huts, weaving or threading beads or sewing or being openly hostile, reading fortunes for silver.
A birchman, or colony thereof 4hd AC 5 (14) dmg 1d8, immune to blunt and piercing weapons, vulnerable to fire.
A rabbit hole, a rabbit hole is like a wormhole but a fantasy one. It leads to the otherworld or at least a pocket of it. It is small but everyone can fit in it.
A dead or wounded patrician.
A gold prospector. Guess what? He's mad. I did not see that coming...
A bridge. Not just an ordinary bridge. It depends on how you cross it. Or who built it. Or who lives under it. Or who disputes your right to pass over it. Or all of these things.