It took Sam several days of extreme precision and focus to create an ability for each of his other skills, because it was never something that could be done carelessly or through pure instinct alone.
To create an ability, Sam needed to understand the skill itself on a fundamental level, not just how to activate it, but how it behaved, how it reacted to his aura, and how it could be shaped into something more refined.
He needed to know how to use it naturally, as if it were an extension of his own body, and that kind of understanding was never instantaneous.
Doing it in the middle of a battle, however, was something else entirely.
That was not something he did often.
And when he did manage it, like with [Crescent Slash] or [Primordial Fireball], it had only been possible because those were skills he had used countless times before.
They were familiar to him. They were etched into his instincts.
