Blood Healers are Silver healers who can heal themselves but are unable to heal others.
"Blood Healers are preceptors, gifted with the ability to heal themselves from almost all wounds and disease. However, their abilities are extremely limited by knowledge, and a deep understanding of the human body is required to utilize this ability to its full extent. Many blood healers are considered immortal, which is a falsehood. Eventually, even the most talented and intelligent of blood healers will succumb to the slow decay of age." - On Silverblooded Abilities by Victoria Aveyard
While not immortal, blood healers can achieve considerable longevity. For example, Ambrosin Calore, son of the late Queen Andura Calore of Norta, is over one hundred years old and probably over a hundred and fifty, yet he is still described as 'ageless.' He is still alive and is King Triarch of Tiraxes.