Kain, considered a useless illegitimate son by his family, was abandoned by his own brothers in the abyss. On the verge of death, he heard a dark echo from the abyss. Thus, Kain awakened the god-level talent [Dark Echo] in the abyss and was resurrected. With a summoned beast that evolved from an ordinary monster into an epic calamity, he returned from the abyss and embarked on a dark path of revenge to reclaim his glory.