The Demonic Cedar Tree, the tyrant of the forest, the steel-like
Gigas Cedar was finally— or should I say easily, chopped down. It was
just 5 days after Eugeo and I used the Blue Rose Sword to practice the
«Aincrad-styled Sword Skills».

The reason was simple. That giant tree was a perfect training
platform. Every time I demonstrated «Horizontal», Eugeo would
practice it over and over again, and the cut on the trunk continued to
deepen. Once the cut occupied about 80% of the diameter, it happened.

“—SEIAA!!”

The giant tree took the horizontal slash from Eugeo’s refined
motion and let out an ominous creaking sound that had never
happened before.

Both of us stared at each other in a dumbstruck manner, and then
at the trunk of the Gigas Cedar that extended all the way into sky, and
we froze in shock as we saw the giant tree fall slowly towards us.

(Alicization Beginning, 344)