Grotesque are unclassified, at this time.
One of the more interesting monsters seen in the WWI 2008 movie, the grotesque are basically living pinatas. They are fat, white, humanoid monsters, who don't seem to have an attack or any way to deal damage. What they do instead is run up to a player who comes into range, take a single hit, bend over backwards, and rupture into a massive fountain of wriggling silver eels. There seem to be far more eels within a grotesque than their volume would permit, but such is the nature of magic.
The eels, properly called Lamprey are wriggling creatures that must be killed lest they consume your character's toes, but they seem to die very quickly, and on the whole the Grotesque/Lamprey combo looks more inventive and amusing than dangerous.