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Users can rapidly regenerate. In other words, they recreate lost or damaged tissues, organs and limbs, sometimes slowing, or even stopping, aging. The rate and amount of healing varies widely; some can regrow missing limbs, others must put the limb back in place for rapid regeneration. They are generally in very good physical shape as their bodies are constantly reverting to healthy state, granting them nigh-inexhaustible stamina and vitality.
At higher levels, users can regenerate not just their cellular tissues, but also their DNA, undoing genetic mutations and breakdown, as well as maintaining one's youth by extending . This also gives them immunity to diseases and infections. If advanced enough, the ability will cause the body to slow down or even cease aging as the cells are regenerating and dying in equilibrium, granting immortality.
Some users can not heal themselves but rather heal others.