I forget the exact terminology, but Ari Corsetina was secretly the human pawn of some great old one. He was saved from the pirates who attacked the ship he served on, and threw him overboard, by a tentacle monster who saved him and then fought on his behalf to give him command of the ship.
The way I interpreted this, and played it, was to say look, Ari’s just a regular guy. He’s a man with a young family, who has to spend long periods away from them to provide for them. He’s a good, loyal guy who sacrifices of himself for others.
He’s not some dashing action hero. I’d say he’s comparable with a guy like Finn in Star Wars. He doesn’t have the special powers, but he’s dragged into all of this, and it tests him.
He eventually gets an inkling that Mirari Corsetina, his daughter, is mixed in with this, that Belladonna Pravus is mixed in with all of this. That everyone he works for, and fights for, and loves and respects, is benefiting from these deep dark powers.
And that power also wants him, and he can feel is watching him with its possibly-malevolent desires, every time he goes out to sea.
What do you do if you’re Ari in this spot? Your wife is dead. Your daughter is all you have left of your old life, and she’s somehow come through everything to a position of influence, comfort, and success. Are you really going to do anything that could possibly take that from her? Of course not.
Or Belladonna. The Pravus family was reaching new heights, and they’ve been very good to you. Are you going to betray them, or undermine them? No!
So what do you do if you’re Ari? You gratefully accept the Knighthood you are given. You quietly watch proudly your daughter do her thing. You serve your lords and ladies.
And when the burden of being watches, and courted, and groomed for some inhuman purpose is too much, you drink.
Mirari’s adopted sister kept stores of wine for trade. Ari frequently broke into those, because it was all he could do.
When he died, he died sacrificing himself at sea, in battle, for family and lords. The beings watching him lashed out when he died, but it was too late. He was at peace, having served those he cared for with all he had.