Centuria

From Viz:

Caught as a stowaway aboard a slave ship, Julian narrowly escapes death by the kindness of fellow slaves who take pity on him, especially a pregnant slave by the name of Mira. But when the slaver decides to liquidate his holdings, the bloodbath calls forth an ancient god from the sea. A deal is made at the cost of a life and Julian is forever changed, gaining fantastic powers. But even with his new abilities, monsters at sea and on land pose a threat in this dark and dangerous world!

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Note: Nominated for the Next Manga Awards in the Web Manga category in 2024 and 2025.