Just go to the left door first. Then defeat the enemies and go all the way to the end.
There's a second floor above the water, right? Travel through the second floor above the
water all the way to the exit, there's a door above the entrance filled with purple acid.
There's a Mega Brute in there, so defeat it. Then you'll see a cutscene with Sheva. Then
go through the other door that opened and fight the enemies in there. Go all the way to
the end, climb up the stairs, and travel across the second floor with the moving platforms
the the entrance of the room again. This time, there's two double doors that will open for
you once you approach them. Go through them and defeat Sheva. It may take one or two times
to defeat her, she makes copies of herself. There's only one real one, and you can tell
because it's not holographic. Just use magic to hit the clones when they're surrounding
you once and kill the real one ASAP. n.n I suggest when they surround you use the "Jump
and Square spell." Jump and use square. :]