After laughing to their heart's content, the voice from the forest said, "That wasn't bad. I was hoping for total death, but this is good too."
Then the speaker egged on the divine beasts, "Go on. Run wild. Destroy everything you hold dear for me to see. Entertain me with your madness."
Legion had mixed feelings about whoever was speaking. On the one hand, they were impressed because the speaker, if they are the one responsible for that attack, should be a rank 9 killer.
The attack that the vine plants had created when they killed themselves looked like it was created using Blood Sacrifice. Blood Sacrifice is a rank 9 divine ability of the pathway of killing, which is why they think the person who was responsible for the attack is a rank 9 killer.
The alternative is that an epic godclad got ahold of a powerful divine artifact created with the corpse of a godling killer or even the corpse of the god of killing and used it to nearly kill two legends. Even that is still impressive.
