Please open the save, press F and update, so the wraith can spawn.
I'll always be ready to help. "If it isn't broken, don't fix it, improve it!"
It was automatically changed in this save, but thanks for help :D
Read all my comments under this, it's IMPORTANT! Remember, the ID is 1534388
After creating the new save, delete this one. Or, if you prefer, paste mine over yours and update.
Your description is wrong, correct the "hravest": This is a machine used by the Wraith in their Darts to HRAVEST people. After arriving at home, they eat them. Corrected version (copy this): This is a machine used by the Wraith in their Darts to harvest people. After arriving at home, they eat them. If you copy, give credit. Please comment, so I can improve it.
I did it, ID:1534388. Save it as yours, writing your description (copy this: This is a machine used by the Wraith in their Darts to hravest people. After arriving at home, they eat them. If you copy, give credit. Please comment, so I can improve it.) and put the save name as Wraith Harvester (from Stargate). There's no need to thank me! :)
I had this idea too, but: I don't know how I could make them disappearing without destroying the output-mechanism :( And in this save, the "harvested" people should only appear at one point in the map