Ordinary Fifth Stage cultivators wouldn't be able to see invisible sword insects, let alone the variant version, the invisible saber insect.
If Song Shuhang's invisible saber insect were to conceal its aura with all its strength, even cultivators at the Sixth Stage wouldn't be able to discover it.
Therefore, while the Celestial was busy dealing with the treasured saber Broken Tyrant, the invisible saber insect had taken advantage of that opportunity to silently get behind the other party and stab them.
Rip~
The defenses of the Celestial were pierced, and the edge of the saber insect smoothly penetrated the other party's lower back.
"Aaah~" The Celestial let out a scream, and subconsciously grabbed at its lower back where it had been injured.
As it did so, the Celestial screamed once more due to having grabbed onto the blade-like body of the invisible saber insect, injuring its hand.