Board Thread:Suggestions forum/@comment-26322120-20160526014636/@comment-25661985-20160528182907

However, I think this mechanic should not affect lands including Mordor, Lothlorien, Lindon, Rivendell, Dol Guldur, and Nan Curunír, because some of them were certainly never corrupted, and the other were never cleansed (Dol Duldur wasn't cleansed until the the final Battle of Mirkwood after the reoccupation of it) until some day.