My campaign is eldritch and fantasy and there is a werewolf clan currently near the party. My players have said that they're immune to lycanthropy because of their PCs' races:
A Stone Child. He says the PC is made of stone, has no blood, and no true brain, and so can't be infected by a lycanthrope. I'm not sure how much of this is true.
A half dragon. She says dragon's blood can't be poisoned. I'm not sure whether that include not being able to be infected by a werewolf.
A Killoren. To the best of my understanding these are fey who died and then possessed a half elf, or something like that. I'm not sure what that means for being affected by lycanthropy or not.
Can any of these races be afflicted with lycanthropy?