Royal Seal of King Llane

Source
This item drops from Yogg-Saron in the 10-man version of Ulduar.

Trivia
This item's flavour text is likely a reference to Shakespeare's Macbeth. It is related to the line in which Lady Macbeth feels the blood from King Duncan will never wash away; similar to Garona Halforcen's sorrow for killing King Llane.