Touka rediscovers his cruelty as he kills monsters in the Ruins of Disposal. He means to escape and exact his revenge on the Goddess Vicius, but to get there, he’ll have to face the grotesque monster that’s killed so many before him—the Soul Eater.
It's the fatal flaw possessed of 
those arrogant in their strength.
‫إنّه العيب القاتل الذي يملكه المغرورون بقوتهم.
Das ist der verhängnisvolle Fehler derer,
die arrogant sind, was ihre Stärke angeht.
Les pasa a los que se creen
más fuertes.
Os pasa a los que os creéis más fuertes.
C’est le point faible mortel
des imbus de leur puissance.
Il tallone di Achille di chi confida
troppo nella sua forza.
É a falha fatal que possuem aqueles
que são arrogantes em sua força.
Это роковая уязвимость
надменного могущества.