Fierce Creature

From MU Wiki

One of a number of potential exceptions from the MU weapons policy. A Fierce Creature is anything which is so innately dangerous it does not require magical weapons to properly defend itself against anything that may wander onto the campus grounds.

One would assume that most students who qualify for this exception would be fairly easily recognizable as such - for example, ogres - and therefore never even be challenged with a weapons check. However, probably all of them are given cards to show, just in case.

Mackenzie originally did not ask for the fierce creature exemption on her student ID because she didn't want to be seen as a monster. However in Chapter 182: Chance Meeting she changed her mind and applied to receive the exemption due to the fact that she couldn't keep people from finding out about her demon heritage anyway and she would rather not have to carry around a weapon she felt she didn't really need.