User can regenerate completely so long as they are not instantly killed by an attack (i.e. disintegration, incineration, one-hit kill). For some users, this involves that as long as the "core" is undamaged, they can regenerate. Because the cells and telomere lengths are constantly regenerating and rejuvenating, they do not age, recover any damaged body parts, and sustenance intake required is drastically reduced, to the point user is close to true immortality. Even complex parts such as damaged brain cells and nerves can be repaired, effectively keeping the mind intact and making decapitation more difficult as the user can simply reattach their heads to the neck, sealing the cut.