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|Spoiler Alert: This page contains spoilers. Read at your own risk.|
Regrowth (再成) is one of Tatsuya's innate and unique abilities. Changes in the Eidos can be rewound up to 24 hours in the past, copying and rewriting the Eidos from before any damage or harm from external sources were incurred, then using Magic Sequences to rewrite the current Eidos. The rewritten target will adhere to the updated information and restore itself to before any harm was suffered.
It is one of the inherent abilities Tatsuya [Destruction & Recreation] was born with. Decomposition describing his Destruction ability while Regrowth describing his ability of Recreation. Note: Both of these abilities are associated with Shiva (Mahesvara), the Hindu Deity of Destruction & Recreation, thus was also used to describe Tatsuya by his enemies during the Defense Battle of Okinawa.
It is one of Tatsuya's two innate active magic abilities along with Decomposition, relying on his innate talent to directly interfere with structural information.
Unlike regular Healing Magic which needs to be repeatedly reapplied during its effective period, Regrowth's effect is perpetual and applying it to a wounded person will make it as if no injury had ever occurred. According to Miyuki, the magic is instantaneous and the target is not restricted to biological organisms. Tatsuya can restore anything, regardless of whether it's the human body or a piece of machinery.
However, Tatsuya must review the catalog of changes in the Eidos to completely copy the Eidos. To do this, he must read through all the stored information regarding the Eidos, including the victim's pain. All the pain is condensed into an instant as it is transmitted.
|“||In this situation, the time elapsed between Isori-senpai being wounded and Onii-sama arriving to use magic was approximately 30 seconds. Onii-sama used about 0.2 seconds to review all the changes in the Eidos. In that brief instance, the condensed pain that weighed on Onii-sama's mind is about 150 times Isori-senpai's suffering.||”|
—Miyuki, Volume 7, Chapter 12
It is noted that the longer the duration of the wound, the greater the condensed pain. Owing to that condition, to erase an injury suffered an hour ago, the caster must suffer pain 10,000 times greater than the original.
When used on someone even if the heart had already stopped, the brain shut down, the throat torn open, if that was the extent of their injuries then revival was still possible. Even an instantly fatal wound, as long as rebuilding the body and restarting the circulation of blood would have had even the faintest chance of resuscitating the person
Just as Decomposition is often referred to as "Demon Right", Regrowth is sometimes referred to as "Divine Left" by the Great Asian Alliance and other terrorist cells.
Self-Restoration is Tatsuya's unique ability to restore his own body to its original state when an abnormality/injury occurs. His personal Restoration ability automatically completes the repair processes in the blink of an eye, although he can deliberately suppress the activation. It has been said that, "the speed of his Self-Restoration ability has long since surpassed the realms of human cognition speeds," and not even Kudou Retsu was able to notice it.
The scars on his body from the harsh training that the Guardians undergo, however, was due to the penalty he put upon himself for his in-capabilities, showcasing his ability to control the magic to some extent. It is automatically cast whenever combat efficiency drops below optimal levels, which Tatsuya cannot stop. If Tatsuya receives a fatal attack, his entire Magic Calculation Area gets monopolized by his Self-Restoration and he is unable to do anything else during that time.