Sundering Shadows offers two templates which can be added to a variety of classes. Adding one of these templates requires a level 30 account, and is considered to be a PK race.

Werewolf
Weretiger

Warning: This is an advanced race, known as a PK-race. It imposes disadvantages on your gameplay: You will be banned in most cities and shunned across the realm. You start with your NOPK-flag turned off and other players may attack you because of your race. You may not, however, attack a player of a standard race without additional provocation.