"Is this... the Gene Lock?!"
Tohsaka Rin held up her telescope and watched the two sisters chasing one another. She cried out in surprise, recognizing the extraordinary ability Illya was displaying.
During the Fourth Holy Grail War... Aozaki Touko had used an ability known as the "Gene Lock" to defeat her father king's Heroic Spirit and win the previous Holy Grail War.
That was... an incredibly powerful and terrifying force.
"The Gene Lock? What's that?"
Nearby, Emiya Shirou voiced his confusion. Not far away, Matou Shinji and Tohsaka Sakura also cast puzzled looks at Tohsaka Rin.
None of them knew much about the so-called Gene Lock. Or rather... the term was far too modern and did not fit the naming conventions magi usually used for magecraft.
"This... how should I explain it?"
Tohsaka Rin continued watching the two sisters in the distance through her telescope. After thinking for a moment, she explained, "It means... creating a Life Tree System belonging to oneself, then modifying that Life Tree System so that one's life rank undergoes a leap, reaching a level equivalent to that of an elemental spirit or even a divine spirit."
"If that's the case, why not just call the ability the Life Tree?"
Emiya Shirou asked, "Wouldn't that describe the ability better? Why use such a modern name?"
"I don't know. It's probably Lady Touko's peculiar sense of humor."
Tohsaka Rin lowered her telescope and slightly furrowed her brows. "Still, there might also be some mysterious intention to conceal the magecraft. Or perhaps... Lady Touko has some strange obsession with the term 'Gene Lock.'"
"No matter what, this ability is still absurd."
Matou Shinji gazed into the distance and twitched the corner of his mouth. "This ability... is no different from the so-called divine authority. Just how much of