Mothman
About
Seven feet of it standing at the edge of the road with wings folded and eyes that hold red at the back. Everyone who sees one describes the same thing afterward: not the shape, but the feeling of having been told something. It appears before the bridge goes, before the mine floods, before the fire. It is not causing any of it and killing it does not stop any of it, and the people who worked that out did so too late to matter.
Stats
Save Rolls
Traits
Special Attack
It does not initiate. Talons: slashing, melee 10 ft, +4 to hit, 2d6+3, used only if attacked and only to break away. The Warning: 60 ft, no attack roll. Save Wis Mind, fail save roll 2d6+2 psychic as the target sees, briefly and without context, what is going to happen here. Cooldown 3 rounds. The DN should show them something true.
Special Defense
Only Ahead of It: it appears in the days before a disaster and cannot be found at any other time, sought out, tracked or summoned. Killing Changes Nothing: reduced to 0 HP it is gone, and the bridge still goes down on schedule. A party that spends the encounter fighting has spent the encounter badly, and the DN should let the consequence land.