Sure, the Gigas Cedar was tough, but in the end, it was still a
tree, a tangible existence. As the original had eventually been
chopped down after hacking at it time after time, this, too, would
be extinguished after getting damaged beyond its limits.

However, the Heaven Piercing Sword's light was a mass of
pure heat. How exactly could an intangible assault be snuffed
out?

Supposing countermeasures exist, it would be either to use a
mirror to deflect it like Kirito had once succeeded with, or
neutralizing it with an absolute frost, stronger than what the
Blue Rose Sword had brought forth; a power with a special trait
capable of opposing it should be necessary. However, listing
through the Gigas Cedar's properties would result in two: its
absurd toughness and its weight—

No, there was one more.

Greedily absorbing Solus's light and turning it into its own
energy.

Fanatio's spear of light was abruptly ripped into over a
thousand streams.

The balance broken, the one to charge forth once again was
the essence of Kirito's giant tree in the color of darkness.

The tip was red-hot to the point of being blinding, but still, it
gouged and shredded through the light without yielding to its
pressure, proceeding towards the source.

(Alicization Rising, 265)