(Heartfelt thanks to 'Ye Ming Xiuluo' for the 1764 reward! And thanks to 'Erciyuan de Shuangxiezuo' and 'Yunqi Qinggu' for their rewards!)
In the end, under Ash's control, the Corpse Ash Dragon left Ansarivan City and rose into the sky, only for Ash to draw the inherent magical armament of the Holy Knight Armor and cleave it in two with a single strike, erasing it from existence.
According to Ash, after he rode the Corpse Ash Dragon, its controlled consciousness merged with his and conveyed its wish: it hoped Ash would let it sleep beneath the earth once more, free from anyone's control.
To have Ash destroy it, the Corpse Ash Dragon even used the last of its strength to promise that, before Ash killed it, it would release Eco from inside its body.
Thus, Ash could finally put his mind at ease and destroy the Corpse Ash Dragon, allowing Eco to escape danger.
It could be said that this time, the one who had saved all of Ansarivan City was Ash himself.
However, instead of receiving everyone's support after saving Ansarivan City, Ash received a steel fist each from Wu Yan, Rebecca, and Sylvia, and ended up flat on the ground.
That was only natural. According to the meaning left behind in the Corpse Ash Dragon's residual consciousness, it should have protected Eco at the very last moment before its death and returned underground.
In other words, if Ash had not interfered twice and made Wu Yan and Rebecca give up on delivering the final blow to the Corpse Ash Dragon, it would have been destroyed long ago, and Eco would not have come to any harm.
Yet Ash's two interventions had forcibly made things far more complicated, so naturally, everyone who had worked so hard was dissatisfied.
Of