Having finished off Garnis, Rein swung his heavy hammer in a backhanded motion, smashing it onto the venomous sea serpent that was biting him, instantly causing the serpent's eyes to glaze over with dizziness and collapse on the spot.
Rein then managed to extricate himself from the gaping maw of the venomous sea serpent.
However, by that time, the extremely potent poison of the sea serpent had begun to take effect, and Rein could distinctly feel bouts of dizziness assaulting his brain.
Fortunately, Rein possessed the core skill of a Deadly Poison Master, 'Poison Resistant Constitution (Passive).' Otherwise, he might have fainted by now and died of poisoning in short order.
But the moment the venomous sea serpent had sprung from the water beside him, Rein had already thought of a way to deal with the problem.
Otherwise, he wouldn't have risked getting bitten by the venomous sea serpent to hammer the four-armed female Naga to death.