History
Little is known of Shaa as her story is told by her former apprentice Momin who also killed her. She taught Momin of the Force and how to wield a lightsaber but anything else she may have done or taught him was not mentioned.
Powers & Abilities
As a Sith she would have the same powers as any other; able to wield the Force. She also was a competent lightsaber duelist but lost to her apprentice and was killed by him in the process.