Healing Flesh Feat 5
Source Pathfinder Howl of the Wild
Some legends claim that the flesh of a merfolk, if consumed, can grant health, longevity, and even immortality. For obvious reasons, merfolk prefer to discourage these rumors (with violence, if necessary), but you're living proof that there's at least a fraction of truth to such claims. When Administering First Aid, Treating Disease, or Treating Wounds, you can take 1 damage to give someone a drop of your blood. When you do so, you don't need healer's tools, and you gain a +1 item bonus to your Medicine check.
If someone were to eat your heart and liver within an hour of your death, they would be healed of all physical injuries (regaining Hit Points up to their maximum) and would cease to age for 8 years.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
MerfolkThese aquatic humanoids have an upper body similar to a human and a lower body similar to a fish.