I’m not asking theories, I’m asking how you would personally end it.

Personally, I’d love to see that Harrison has been stalking Dexter for years, and studying the BHB before seeking to locate him. He finds location from Hannah, whether she’s alive or not does not matter. He then fools dexter (to get evidence according to the code) and then dexter ends up on his table, whilst pictures are hung (or drawn) of Debra, Rita, Doakes, and LaGuerta. But Harrison is not like dexter, his “dark passenger” is now gone like lumen, he wanted revenge only. Credits cut to a clip of trinity telling baby Harrison something along the lines of “it’s your dads fault”