Lycanthrope

Werewolf form traits:
 * Pick a Core race. That race is your normal form when not in Lycantrope mode. You do not receive traits for this race. You gain the shapechanger subtype.
 * +2 Wisdom, -2 Charisma.
 * You gain Low-light vision.
 * You gain the scent special ability.
 * You gain the ability change shape (su) which allows you to transform between werewolf and your normal humanoid form. This ability takes a full round action. You must pass a DC15 Constitution check to turn into a werewolf, or DC20 Constitution check to turn back into your normal form. If you use this ability between sunrise and sunset, you gain a +2 morale bonus on your Constitution check to assume werewolf form, but a -2 penalty to Constitution checks to assume normal form. On nights when the full moon is visible, you gain a +5 morale bonus on your Constitution check to assume werewolf form, but a -5 penalty to assume normal form. You also revert to normal form during each sunrise or after 8 hours of rest, whichever comes first. A slain lycanthrope reverts to normal form, although he remains dead.
 * A dose of Wolfsbane will cure Lycanthropy.
 * When in werewolf form, you are restricted in the actions you can take, similar to that of the barbarian's Rage ability. You cannot use any Charisma-, Dexterity-, or Intelligence-based skills (except Acrobatics, Fly, Intimidate, and Ride) or any ability that requires patience or concentration.
 * +2 Strength, +2 Dexterity, +2 Constitution
 * Speed: 30 feet.
 * You gain a bite attack which deals 1d6 damage. On a successful hit, you may take a free action to trip your opponent without provoking an attack of opportunity.
 * You gain Lycanthrope Empathy (Ex) which allows you to communicate and empathise with wolves. You can use diplomacy to influence their attitudes and you gain a +4 racial bonus on the check.
 * +2 Natural Armour
 * DR5/Silver