Regeneration, often referred to as a healing factor, is the ability to heal from wounds at an accelerated rate, with many characters proving capable of regenerating from wounds that would be lethal to normal humans. It has several different levels that range in potency from what is essentially just faster natural healing to being able to regrow limbs or organs, or even a severed head. Higher levels allow characters to regenerate from even more severe wounds, such as being blown to pieces, reduced to a single cell, vaporization, and even complete physical destruction and beyond.
Low: Merely an accelerated healing ability for normal wounds, allowing the character to heal wounds that would normally take days, weeks, or even months much more quickly, sometimes even in just seconds. For machines and vehicles, this would just be regenerating basic exterior damage.
- Examples: Mako Stride with Weakened Kaedna (Heir of Light)
Mid-Low: The ability to heal wounds that would normally leave large scars, such as severe burns or deep injuries. For machines and vehicles, this would be regenerating damage that would normally leave large dents and openings.
High-Low: The ability to regenerate severed fingers, toes, or ears, minor organ damage, and even potentially reattach lost limbs. For machines and vehicles, this would be regenerating some interior damage, along with some minor critically damaged or destroyed parts.
Low-Mid: The ability to regenerate lost limbs, and even from severe organ damage or destruction, including traditionally fatal wounds and disembowelment or horizontal bisection. For machines and vehicles, this would be regenerating minor parts and more extensive internal damage.
- Examples: Shirou Emiya with Avalon (From Fake Dreams), Various Hallows (Monarchverse), Neptune and SOLSTICE (Starcross)
Mid: The ability to regenerate from decapitation or severe brain damage. For machines and vehicles, this would be regenerating from the destruction of critical parts, such as the engine.
High-Mid: The ability to regenerate from being blown/cut to pieces, or from a small piece of your body, such as your severed head, a single organ, or a finger.
Low-High: The ability to regenerate from having no solid parts of the body remaining. This can range from a puddle or drop of blood to even a single cell. For robots and machines, this can also include regenerating from a liquid state.
Mid-High: The ability to regenerate from having all biology completely incinerated. This includes being reduced to ash, dust, smoke, vapor, or plasma.
High: The ability to regenerate from a few scattered or lone molecules, atoms, or sub-atomic particles.
Low-Godly: The ability to regenerate from the complete physical destruction of the user's body, instead restoring it from their disembodied consciousness, whether that be their soul, mind, some other nonphysical aspect of themself, esoteric or metaphysical energy, or something else.
Mid-Godly: The ability to regenerate even after being completely erased from existence, including mind, body, and soul.
High-Godly: The ability to regenerate after erasure from all aspects of existence, such as from history, narrative/plot, or conceptual/information destruction.