Slashing back with the Blue Rose Sword, heavier than a lump
of steel of equivalent size, through physical strength alone, was
impossible regardless of how strong one was. There was only
one reason why it was made possible: it was a secret move from
a swordsmanship style. Aincrad-style two-hits skill, «Vertical
Arc».

The blade that swiftly carved out a trail that resembled the
sacred letter, 'V', sliced through the integrity knight's breastplate
diagonally. A few deep crimson drops spattered from the gash
sliced into the copper-colored armor. The sword tip caught the
knight's flesh—but it was only shallow.

(Alicization Rising, 171)