they together with their mother were usually called the 'four horsewomen of the apocalypse ' within the college , he knew them because viviana , the younger sister used to study in the faculty of sciences where she caused a lot of conflict by dating multiple people at the same time and making them fight each other , so far she had not been very successful , but some day she was going to cause a tragedy , out of the three she was the tallest with dark hair and slightly brownish skin .