Mysa Nal is the real name of
White Witch, a member of the
Legion of Super-Heroes.
The younger sister of Nura Nal, Dream Girl, Mysa grew up on
Naltor, a world where all of the inhabitants have the ability
to see the future. Mysa was born without this precognative
ability, and so found life on her homeworld difficult. She went
to Sorcerer's World where she found she had an affinity for magic.
There she fell under the influence of the villian Mordru and was
transformed by a spell into the Hag. It is in this form that
she first encountered the Legion of Super-Heroes. She was
eventually transformed back into her normal form, and after helping
defend Sorcerer's World from Darkseid, was offered membership
in the Legion.
White Witch has the ability to do many different things with her
spells, including heal, teleport, transform matter, etc. She
is limited by the spells that she has studied.
White Witch resigned after Brainiac 5 sacrificed the Infinity
Man to gain revenge upon the Time Trapper for the death of
Superboy.