Rimefang's Harness

Rimefang's Harness is a powerful magical harness of the frost wyrm Rimefang. The Sveldrek vrykul got hold of it and used it to subjugate new frost wyrms, until the Deathlord and Minerva Ravensorrow attacked the Sveldrek in the Pit of Saron and claimed it for the Knights of the Ebon Blade.

Source
This item drops from Andjor Dragontamer in the Pit of Saron.

As a quest objective
This item is an objective of Harnessing Power.