Sixth Soul bound
A few hours before the tree of life and death descended. Adrian is amidst the monster horde that is attacking his own village. Adrian's soul bounds told him that some monsters managed to get across because of their nature or special abilities.
Adrian thought that his soul bounds just got reckless, but they could not be stopped by low level monsters with their powers. Sirius could handle several monsters at once since he could use Phantom Rush. Kanlaon could literally burn and freeze his enemies to death while Saena would immediately heal anyone who gets slightly injured with a flap of her wings.
Charon could tank any magical attacks while Dodu can just ignore physical attacks altogether. Since some monsters managed to get pass them then that would mean that monster is unique. Just as Adrian arrived to intercept a monster or five monsters of the same species came to attack him.