"But then I started to lose days in my memories. According to my followers, and Myrtle I would disappear for hours and be aloof and distant when I did return. I didn't know what was happening. Then a Hufflepuff Muggleborn turned up petrified. I knew immediately it had to of been Aziza, not many things can petrify like a Basilisk, only two that it is known. A dark sorcerer of all Magic with the Parseltongue gift, even I cannot do it yet, and a Magically bred stonefish, touching their spines will petrify you. If you place a male and female normal stonefish in a lake surrounded by Magic, like ours or the Great Lake at Hogwarts, their offspring will be a magical mutated creature. We still don't know how, it is the only Muggle creature to do so, it is rumoured they were originally magical creatures that adapted to a Muggle world so emerging it in Magic brings it forward again. So it was fairly clear to me what the cause was, but Aziza can't leave the Chamber into the actual school unless ordered by a Parselmouth."