|Shadowrest used to be a place which allowed players to retrieve decayed corpses. Speak with Devin Traical in the Plane of Knowledge for a port up.
From the February 15, 2017 patch notes :
"The Emissaries of Shadowrest are retiring now that Shadowrest is no longer a repository for forgotten bodies, with one exception: the Emissary in Plane of Knowledge is still available should adventurers wish to visit Shadowrest and reminisce about the olden days."
Obsolete information :
Many other emissaries were previously available in East Commonlands, Toxxulia Forest, Qeynos Hills, The Feerrott, Butcherblock Mountains, The Field of Bone, Shadeweaver's Thicket and Misty Thicket.
If you have multiple expired corpses, you will need to make multiple visits to the zone.