Desdemona (Real Self)
Evil Desdemona is the main antagonist of Season 2. Desdemona is a very powerful witch in the Witches' Council who was first seen in Season 2 episode 1 "(Jax of Hearts)". During season 2 episode 5 "The Fool Moon", she is exposed to the "Fool Moon" and her evil self which she states that Emma's mom helped her get through is brought back after 20 years. In the season finale, Desdemona is brought back to her normal state after the powers of the "Fool Moon".
Desdemona is Emma's new guardian while Lily is in training. The Fool Moon turns her into a bad witch bent on destroying the magic realm. She wants Emma to lose her powers so she can be the only witch standing. She is changed back to normal by the last light and doesn't remember anything that happened to her.
Little is known about what exactly happened during the last Fool Moon, but the evil side of Desdemona seems to resent Maria for it.
Evil Emma and Jax wanted to work with Evil Desdemona to take over the Magic Realm but she soon decided to double cross them.
Evil Emma talked Jax into joining Desdemona. However, Jax and Evil Emma both betrayed her after they decided to double-cross one another.
The image gallery for Evil Desdemona may be viewed here.