Kirito's black eyes flared wide open and were gleaming with
overwhelming resolve. His voice that recited the final verse was
filled with an unwavering determination befitting the dire
circumstances.

“Enhance armament!!”

Facing straight ahead, the blade of the black sword pulsed.
Immediately after, strands of darkness flowed out from all
over the blade.

The pitch-black torrent that seemed to suck in all light rippled,
twisted, and entangled around itself. They became a spear, thick
enough to wrap one's arms around, in an instant and increasingly
pushed forward.

Upon straining his eyes, it seemed only the sharpened tip was
solidly materialized, taking on an obsidian-like gleam. He could
recall that texture. The gigantic tree Eugeo swung an axe at, day
after day. The «demonic tree» from which that black sword
originated—the Gigas Cedar.

The moment he recognized it, Eugeo understood the true
form behind the full control art Kirito activated.

He had awoken the memories sleeping within the black sword
through the art ritual and projected into this location the
appearance it could once boast of, that of the gigantic tree that
refused to be hacked down over hundreds of years. Of course, its
shape and size had not remained the same as it was then, but its
essence was exactly the same.

Tough, sharp, and an overwhelming mass.

Its very existence was worthy of becoming an ultimate
weapon.

(Alicization Rising, 262)