Harkon's Bite
Source: Ravenloft - The Horrors Within
Wondrous Item, Uncommon (requires Attunement by a Humanoid)
A dire wolf’s tooth dangles from this simple cord necklace. You gain a +1 bonus to ability checks and saving throws while you wear this necklace.
Curse. This necklace is cursed. Attuning to the necklace curses you; this curse can’t be removed until Harkon Lukas dies. As long as you remain cursed, you become a Werewolf serving Harkon Lukas under the DM’s control during the night of a full moon.