The user is or has the ability to take on the form of a monster, a creature that is often hideous and may produce fear or physical harm by either its appearance or its actions. The word "monster" derives from Latin monstrum, an aberrant occurrence, usually biological, that was taken as a sign that something was wrong within the natural order. The word connotes something wrong or evil; a monster is generally morally objectionable, physically or psychologically hideous, and/or a freak of nature.