Shridra

Shridra was a drow vampire priestess of Lolth that was defeated by the Disciples of Dreth'dor. Among vampires, she was a renegade, remaining separate from the cabals and not following their rules. Her property was often demarked by a certain symbol: a ring within an equilateral triangle. The Order of Solis interpreted the ring in this symbol to represent an eclipsed sun, and with the triangle being a symbol of power, together these elements represented the power to eclipse the sun.