Can a single humanoid be cursed with multiple types of lycanthropy ?
Like let's say a Weretigerboar, or a Werewolfrat ?
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I don't see anything preventing this in the Monster Manual or its errata. I also did a very quick search to see if Mearls or Crawford answered this question before and didn't see anything. If anything that isn't against the RAW is fair game, I guess yes is possible. However, that leaves a huge question for the DM: What in the world happens when the full moon rises, especially if the forms' alignments, like those of a werewolfbear, are incompatible?
I think most DMs would rule no, that it is impossible to have two forms of lycanthropy, opting that getting a second curse of lycanthropy either is impossible or replaces the first. Moreover, lycanthropy is already very powerful; getting "cursed" twice with it could really be game breaking.
Even though there isn't anything explicitly disallowing multiple lycanthropy curses, there is an argument to be made that it's "almost impossible".
First note that the MM has the following to say:
Curse of Lycanthropy. A humanoid creature can be afflicted with the curse of lycanthropy after being wounded by a lycanthrope.
This could mean that damage must be dealt. However, I'm a little unsure about this bit, so I've asked a question here.
Continuing from the above: once you're inflicted with lycanthropy, you're immune to non-magical melee attacks... meaning the very attack that might have delivered a second lycanthropy curse, is unable to do any damage.
(There are of course ways around this; such as a Level 6 Monk's Ki-Empowered Strikes. Which is why I said "almost impossible".)
However, even disregarding the above, there are some things to consider making it extremely unlikely to be cursed with multiple types of lycanthropy: