Masque of Clavicus Vile (Oblivion)

The Masque of Clavicus Vile is the Daedric artifact of the Daedric Prince Clavicus Vile.

Acquisition
The Masque is obtained by completing Clavicus Vile's quest. It could also be traded in for the Umbra Sword, so it is possible to not receive the Masque.

It is necessary, however, for the Umbra Sword to be traded in to get the Masque during the quest, and the Hero of Kvatch can choose to keep the sword instead. If the Hero chooses not to trade in the sword, then they will never receive the Masque.