I had a question following a discussion in my 5e group. Can a Warforged become a vampire or a lycanthrope? If so, do their appearances change like a more organic race? Under the original 3.5 rules warforged could not become werewolves or most undead. Under 5E rules as written they are humanoids and could be. So it’s up to your DM to decide.
— Keith Baker (@HellcowKeith) November 21, 2020