This spawns from Ephemeral nodes that spawn rotate every 4 hours (ET) in five different zones. You cannot detect these using Truth of the Mountain and Lay of the Land II.
DRAVANIAN FORELANDS - 4AM-8AM (X17,Y27)
DRAVANIAN HINTERLANDS - 8AM-12PM (X26,Y24)
CHURNING MIST - 12PM-4PM (X29,Y19)
THE SEA OF CLOUDS - 4PM-8PM (X34,Y30)
COERTHAS WESTERN HIGHLANDS - 8PM-12AM (X21,Y28)
The items are randomized.