Summary

Thalassion is the giant-fish boss linked to the Backwaters fishing chain and the Gilded Rod upgrade.

How the fight goes

This is a good reminder that some bosses sit behind side systems. The route matters as much as the fight itself.

Attack patterns

Expect a fish-specific encounter with movement pressure that feels different from the island's land bosses.

Spoils of the fight

Defeating Thalassion ties directly into the fishing progression and the final rod upgrade.

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