ESRB ratings are usually good for a laugh, as they have to spell out in quite a plain and matter-of-fact manner the themes which are contained within each game, and the rating for Castlevania: Lords of Shadow - Mirror of Fate is certainly no exception.
The game has been deemed 'Mature' by the ESRB, and goes on to list the grisly details:
Content descriptors: Blood and Gore, Partial Nudity, Suggestive Themes, Violence
Rating summary: This is an action-adventure game in which players assume the roles of several members of the Belmont Family as they battle evil forces in a supernatural setting. Players use whips, chains, axes, and other bladed weapons to attack a variety of fantastical creatures (e.g., zombies, werewolves, vampires, harpies). Boss battles contain more frenetic action, with interactive sequences that allow players to stab creatures close-up (e.g., cutting off creatures limbs/torsos; stabbing monsters in the eye). A handful of cutscenes depict human characters getting stabbed with large stakes. Enemies emit splashes of blood when struck, and some enemies burst into pieces when killed. During the course of the game, an extended sequence depicts a female vampire seducing a character while caressing a woman's thigh. A handful of creatures briefly appear topless in battle, and a male werewolve character appears to have an appendage/genatalia between its legs
Fans of "werewolve [sic] genatalia" will no doubt be rubbing their hands in anticipation for the game's March release.