Charal's magic ring
From Wookieepedia, the Star Wars wiki.
Charal's magic ring was a powerful object that granted the user shapeshifting powers, likely through the use of the Force. The Nightsister Charal, the only known owner of this device, used it to transform into the form of a raven. She used it to great effect during her service to the Sanyassan Marauders. However, the ring was eventually seized by the Marauders' leader, King Terak, who wore it around his neck. Eventually, the ring was destroyed in an encounter with the Ewoks. The great power of the ring was unleashed upon Terak, burning him to death. The destruction of the ring trapped Charal in her form as a raven with no hope of escape.
It is unknown if this ring had any relation to the ring used by the Totem Master on Endor.
