Wesen

Wesen refers to an entire species of bizarre, sentient creatures featured in the NBC supernatural fantasy series Grimm. The Wesen are broken up into many different sub-groups, but one characteristic common to all of them is that they can assume human form and easily operate within normal human society. In contrast to the Wesen are the Grimms, who are a family line of hunters gifted with the ability to perceive the Wesen in their true forms. Normally, this type of clarity only occurs if the Wesen in particular is under some degree of stress or agitation.

Though there are many different breeds of Wesen, the two that present themselves with the most regularity are the Hexenbiest and the Blutbaden. The Hexenbiests are goblin-like witches and are first represented in the series in the form of Adalind Schade. The Blutbaden, vulgarized by others to mean "Big Bad Wolf", are essentially werewolves. One of the main characters from the series, Eddie Monroe is a reformed Blutbad, preferring to supress his kind's predatory killer instincts.