skizzerz |
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I'm unaware of any feat that lets you start as a lycanthrope. However, Book of the Damned contains the Fiendish Obedience feat, which if you take that and worship Jezelda, you become an afflicted werewolf at level 16 and a natural one at level 20 (werewolves only).
If you're ok with it, and the rest of the party is at least level 2, you can just have him start as a natural lycanthrope at 1 level less than the party. The Bestiary offers the following advice on this: "If a player wants to play a lycanthrope, he should play a natural lycanthrope and follow the guidelines for playing a character of a powerful race." In any event, allowing the lycanthropy template on a PC is 100% up to you as the GM -- there is no default assumption that says that players are allowed to take templates.
There's also the lycanthropy corruption from Horror Adventures as a slightly more "balance-friendly" way to get lycanthropy into a party (read: tons of drawbacks and possibility of losing your character).