Oh yeah, even more important, it in fact would lose the immortality too. Didn't think of that for some reason at first.
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Great indebtedness does not make men grateful, but vengeful; and if a little charity is not forgotten, it turns into a gnawing worm.
If a vampire turns into a werewolf he will lose his stats, attacks, fear, flying and immortality at the very least. If you want werewolves either give the amulet to a spy/basic commander or just cast call of the wilds.