Sogdianus' Scimitar

Origin
Sogdianus ruled the Achaemenid Empire of Persia for a short period of time, the illegitimate son of Artaxerxes I. His older brother Xerxes II ascended to the throne, but only ruled for forty-five days before Sogdianus had his men kill him. Sogdianus subsequently reigned for over six months before his younger half-brother Ochus executed him by suffocation with ash.

Effects
The user has their greed, jealousy or hatred of their more prosperous family members amplified until they want to murder them. Afterwards, it will turn the air they inhale into ash, effectively clogging up their respiratory system.