True Form (3.5e Maneuver)

''The wizard turned into a dragon, snapping down his mighty jaws onto you only to find normal human jaws gently nibbling on your shoulderpad. Well, this was shameful.''

If you are attacked in melee by a shapechanged creature (either by spells or natural abilities) you may interrupt their attack with a disruptive attempt of your own, possibly suppressing their shapechanging powers. For the purposes of this ability, the natural form of lycanthropes are their humanoid forms. Before their attack hits, you may make a touch attack to hit them and a Control Shape check against DC 10 + the spell's caster level (for magic) or DC 10 + the creature's HD (for inherent abilities such as by being a lycanthrope). If successful, the creature immediately reverts to their natural form to complete their attack action, and their ability to shapechange into another form is suppressed for 1 minute.

This is a supernatural maneuver.