Two days later, Angel walked out of the Nightmare Realm.
He had been using illusion techniques in the Nightmare Realm to simulate skin grafts for the past two days, totaling 50 simulations, with 6 failures. Most of the failures occurred on the first day due to him performing the transplant on himself, which required the assistance of the Hand of Magic. Errors in control led to the failures.
After analyzing the reasons for the failures, Angel's success rate improved significantly the next day. Aside from a small distraction in the first attempt that caused a failure, the rest were successful.
Such a success rate is considered high among similar skin grafts. Other Wizards performing self-skin grafts could probably achieve an 80% success rate, which would already be decent.
As an Alchemist who often manipulates the Hand of Magic, Angel, despite his initial unfamiliarity, has far superior fine control than his peers, which is why his success rate is higher.