With the merrow's song and the Sea God's own heartbeat cancelling each other out, Guts forces his ruined body upright for one final strike, splitting the monster's heart and ending the creature that swallowed him whole.
The merrow's chorus leaves the Sea God thrashing in agony, baffling the crew above who cannot see the cause. Isidro catches the distant melody drifting off the waves, and inside the monster a shaking Schierke hears it too. Abruptly both the song and the creature's pulse fade at once, and the witch understands that the two forces have negated one another. Seizing the lull, she pushes Guts to rise. He hauls the Dragon Slayer up, gets to his feet, and begs the Beast of Darkness to grant him the pain he needs to keep going.
Blood streams from the seams of the armor as Schierke steers him toward the heart, each step tearing his wounds wider. The clustered eyes on the organ track his approach. Raising the great blade overhead, Guts brings it down in a single enormous stroke that cleaves the heart open, and a colossal blast of wind hurls him away as it bleeds out.
Choking up gore along with the wrecked ships it had devoured, the Sea God buckles inward and dies. Schierke snaps back into her own body aboard the Seahorse, ringed by her companions. When Isidro asks after Guts, her sudden panic silences the group as she recalls exactly where he remains trapped.
The opposing song and heartbeat neutralize each other, giving Guts an opening. He severs the Sea God's heart with one strike and is blown clear as it perishes. The monster collapses and sinks. Schierke returns to her physical form, only to realize with dread that Guts is still inside the dead creature.

Naruto vs Luffy with the twist nobody asked for: Luffy tickled Hinata on date night, and she kind of liked it. We break down the whole fight and commit to a winner....

There are no women on Namek. That isn't an oversight, it's the biology. Why we handed Piccolo the one thing his own species rules out, and why it had to be trap soul....
The Sea God is a colossal deity like sea creature in Berserk that swallowed Guts and menaced the Seahorse during the Fantasia Arc; chapter 326, Siren, depicts its death when Guts finally destroys its heart.
With the merrow's song and the Sea God's heartbeat momentarily canceling each other out, Guts forces himself upright and cleaves the creature's giant heart with one stroke of the Dragon Slayer, and the resulting blast of wind hurls him away as it dies.
The Sea God chokes up gore and the wrecked ships it had devoured, buckles inward, and dies, sinking beneath the waves.
Once Schierke snaps back into her own body aboard the Seahorse, Isidro asks after Guts, and she realizes with dread that he is still trapped inside the now dead creature.
The merrow's chorus and the Sea God's own heartbeat cancel each other out, giving Guts a brief lull in the pain and confusion that lets him rise and land his final blow.
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