Elemental Master of Shadow

The Elemental Master of Shadow was one of the original Elemental Masters. She is Shade's ancestor.

Spellbound
The Elemental Master of Shadow was a member of the Elemental Alliance. When the Serpentine broke the truce and attacked Jamanakai Village during the Serpentine War, she defended the village alongside the Masters of Water, Gravity and fire. However, the arrival of the unbeatable Anacondrai forced them to retreat.

During a battle against the Anacondrai in Birchwood Forest, Chen manipulated the Elemental Master of Earth to turn against the other Masters, causing them to lose the battle. Eventually, they found a new way to defeat the Serpentine—through the use of the Sacred Flutes as a means of forcing the Serpentine into tombs scattered across Ninjago.

Trivia

 * On September 21, 2016, LEGO employee Tommy Andreasen confirmed via Twitter that the character is the Elemental Master of Shadow and not Light, as she was previously believed to be the ancestor of Paleman.