Werebeasts, a.k.a. lycanthropes, are wonderful enemies. A werebeast encounter can be awesome action or tragic drama. Werebeasts lend themselves perfectly to horror-mystery adventures, in which the players have no idea which of the villagers is the true villain. They threaten to transmit their lycanthropic curse to any character who fights them hand-to-hand—monsters who can make the player characters into monsters themselves. Practically by definition, werebeast encounters take place at night, when everything is scarier. And if the werewolf ever seems too clichéd an enemy, werebeasts come in four other varieties.
All werebeasts have proficiency in Perception and immunity to physical damage from nonmagical, nonsilvered weapons. They also have human forms, beast forms and hybrid forms; their human forms are their “true” forms. My sense as a dungeon master is that they take their beast forms to run around and hunt in the wild, but among people, they take their hybrid forms when their curse is upon them—at any rate, the hybrid form makes for more interesting and challenging combat encounters than the beast form, because it allows them to use their Multiattack action feature. (The exception to this pattern is the werebear, which has Multiattack in all its forms.) But if you want to conceal the fact that the PCs are fighting a lycanthrope and not simply a big, ferocious beast, you may opt for the beast form after all, trading a reduction in damage for the increase in likelihood that the PCs will carelessly let themselves fall afoul of the lycanthropic curse.
Although the Shapechanger feature, common to all werebeasts, states that they can use an action to polymorph from one form to another, I’d disregard this, for two reasons. First, there’s generally no advantage to it: any equipment they’re carrying isn’t transformed, so, for example, a humanoid wearing armor and carrying a sword turns into a beast standing in a pile of armor and staring at a sword on the ground; or a hybrid with natural armor turns into a naked, unarmored, unarmed humanoid. Meanwhile, it’s just spent a whole combat round transforming when it could have been, I don’t know, attacking or running away? And second, isn’t the whole point of lycanthropy that the afflicted individual has little or no control over his or her transformations? High opportunity cost, no obvious benefit, contradicts werebeast lore: there’s only one logical situation in which to use this action, and that’s at nightfall or daybreak, when the lycanthrope changes involuntarily. (more…)