The Black Lotuses

This shadowy group of assassins punishes those who would break the rules of the school. They're rarely seen except when someone causes trouble, and come and go extremely quickly. They're rumored to be an all female group, although since they're seen so sparsely, it's hard to tell.

No Killing
Killing another student is prohibited and will be met with severe punishment. The Lotuses will hunt you down if you kill another student.

Skill Restrictions
Under most circumstances, students are not allowed to use abilities that have been given a Rank two Ranks higher than their own. There are some special cases where this rule is ignored, most notably in Ranking matches against higher Ranked opponents. Punishment depends on how powerful the skill is and how many times this rule has been broken. As a rule of thumb, it's better off to not use skills that are out of your Ranking range at all.