Thrud Earring

Cannot be auctioned, traded, bazaared, or delivered.
Cannot be obtained as a random reward from the Gobbie Mystery Box Special Dial and similar sources.

Þrúðr (Old Norse for "strength"), sometimes anglicized as Thrúd or Thrud, is a daughter of the major god Thor and the goddess Sif in Norse mythology. Þrúðr is also the name of one of the valkyries who serve ale to the einherjar in Valhalla (Grímnismál, stanza 36). The two may or may not be the same figure. (Wikipedia)