Curse Of Shades

The Curse Of Shades is a spell that Shadowia the shadow lady cast on the Smurfs and Smurfettes in season 24 of Smurfs: The Magical Blue story "The Final Time Journey Ends." It basically had the ability to let any villain locate them.

In the story, Shadowia invaded Smurf Village and used the curse to let Gargamel and Cerahine know the location of the village. However, the curse somehow had covered the village in darkness, which made it impossible to find the Smurfs or Smurfettes in the dark, eventually, the curse wore off and the terrible two were launched back to the hovel.