Holy Symbol of Ravenkind

What we know

Platinum amulet shaped like a sunburst with enormous ruby at center (Session 6 @ 01:20:31)
Legend: given to Lugdana by an angel in guise of a raven (Session 6 @ 01:20:31)
Shed lights of the sun—weapon against creatures of the night; deadly to lesser vampires (Session 22 @ 00:48:00)
Party believes it would affect Strahd von Zarovich but not destroy him outright (Session 22 @ 00:48:00)
Lugdana companions at Yester Hill: archer Livius Martikov and Ismark the Great (Session 22 @ 00:48:00)
Lost when Lugdana fell at Yester Hill vs Chernovog; body and symbol never recovered (Session 6 @ 01:20:31)

Named in Eliza's ballad at Tser Pool (Session 6 @ 01:17:12)
Father Lucian Petrovich expanded legend during Session 22 (Session 22 @ 00:48:00)