User blog comment:Lesdin/Tylane, the Furor of Thousands/@comment-26815373-20160407185743/@comment-24385282-20160407222201

Another possible interpretation of Terse Encore's vision inhibition (mine) was that it creates Fog of War within Torrid Heaven's boundaries - the difference between this and brush being that anything beyond the boundaries is still visible, so it's essentially just a reverse-.