Emil Valgeir
Emil Valgier was the last Ar-Ulric, high priest of the Cult of Ulric and one of the Electors of the Empire.
During the End Times he accompanied the Imperial forces after Kislev is overrun and almost entirely obliterated by the forces of Chaos. The northern border of the Empire becomes a major battleground, with Balthasar Gelt's construction of the Auric Bastion along the Empire's northern border the only thing holding back the Chaos hordes.
At some point during this time he was slain by the The Changeling, a shape-shifting daemon. This daemon then masqueraded as Valgeir, assassinating other important figures and sabotaged Imperial defense efforts. Ultimately, with his puppet Gelt, the daemon orchestrated an assassination attempt on the Emperor but was foiled and destroyed by Valten and Ludwig Schwarzhelm.