Legend Lore: Advanced Doppelganger

Long ago, a powerful being known as Rohini was introduced into the ancient Oshran Empire. A seductress, demon, devil, shapechanger - a wicked enchanter who sought the downfall of the Oshran People. She sired many children, Sons and Daughters of Rohini. The modern doppelganger is a distant cry from these shifting creatures, but some Advanced Doppelgangers still exist.
Advanced Doppelgangers retained Rohinis ability to take the form of other creatures, but unlike their descendants - can gain the traits and attributes of those they turn into. They follow in Rohini's footsteps, aiming to cause death and disruption where they walk.
It is rumoured that some of Rohinis original Sons and Daughters still roam the planes.