...The light reflected off its pale green surface, glinting off what seemed to be veins coursing through the stone. A curious ring, just lying there as if asking to be found…
A quick flash of steel was all that was seen in the moonlight…
With but a word, the small mantis made of fine copper wire came to life; growing at an alarming rate, ready to defend its owner…
A loud crack broke the silence of the night. A piercing howl of pure agony followed, but was cut short after a moment by a low gurgle and a thump. Cedir smiled coyly, just another victim of the Tongue of Demons
...The ring slid onto her finger as if it were lovingly crafted just for her. Its diamond seemed to take in the sunlight, amplify and reflect it in every direction. Then almost immediately, the light waned and the stone went dark. Her throat clutched in a constricting gurgle before she slumped to the ground, still and lifeless.
The local band of 'nasties' (goblins / orcs / whatever) lives in relative peace with the local population.
Along come the PCs and go through their usual heroic monster bashing routine, wiping out the nasties and pinching all their stuff, then continue on their way.
Problem is, they don't kill ALL he nasties. The survivors want revenge and, after spending a few months recovering, start to take it in their own inimitable style (which is not unlike that of the PCs come to think of it).
Next time the PCs are in the area they find themselves VERY unpopular with the townsfolk.