All the Wight Reasons?

[Inziladun]

Originally Posted by Rumil

Perhaps to stop any re-colonisation of Cardolan by Arthedain?

Hmm. The problem with that is that the Downs themselves lay at the extreme northwest of Cardolan, the bounds of which were the Brandywine, the Road, and the Greyflood. Having spirits inhabit a grave site at the outliers of the realm wouldn't seem to accomplish that goal.