Inu of the River's page

Amphibious: Some undines are born with a permanent bond to water. Undines with this racial trait gain the aquatic subtype and amphibious special quality.
Hydrated Vitality: An undine with this racial trait gains fast healing 2 for 1 round anytime she submerges completely within a body of natural salt water, fresh water, or brackish water. Stagnant, poisoned, or trapped water (such as an artificial pit or a bag of holding) does not activate this ability. The undine can heal up to 2 hit points per level per day with this ability, after which it ceases to function.
Linnorm Style: While using this style, you take a –2 penalty to your AC against melee attacks. After a creature makes a melee attack against you, you can choose to add your Wisdom bonus to the damage from your unarmed strikes against that creature, rather than your Strength bonus. If you can normally add your Dexterity bonus to the attack’s damage, you can instead replace it with your Wisdom bonus. This lasts until the beginning of the target creature’s next turn.