Aspect of Anguish

Aspect of Anguish,  Andariel's Minion is a unique  Toxic Construct found in Silver Spire Level 1 (Campaign) or Gardens of Hope (Adventure Mode) in Diablo III.

In Campaign, it is initially disguised as Maghda's ghost, revealing its true self when spoken to. Killing it is not mandatory.

In combat, it has, as well as one unavoidable Fire attack (requires some time to charge up).

Despite being based on an Undead monster, Aspect of Anguish counts as a Demon.