The Abyssal Sermon... The first recipient was Ansel himself.
To reclaim his mother's life from that predetermined future, Ansel performed the sermon on himself at age ten, exchanging with the Abyss for terrifying power capable of instantly crushing five fifth-stage extraordinary beings... no, even fifty or five hundred with equal ease.
Anelisa, possessing a powerful soul, sacrificed her entire being to eliminate the negative effects of Ansel's sermon - the nearly irreversible Abyssal corruption.
Since then, Ansel rarely used the sermon on himself, unwilling to experience that... pitch-black despair again.
Without Nine, Ansel would have been forced to draw this reluctant trump card, allowing the Abyssal tendrils to further spread in his soul. This time... no one would have been there to negate the corruption with their own soul.