First, I want to say that using the archetype rules to reinterpret prestige classes is a fantastic idea and I can't wait to see more of them. And the Assassin presented in this book shows good promise for the concept overall.
This archetype does not replace every level available, but packs a lot into what it does replace by handing every character the ability to make death attacks, hide in plain sight, and eventually swift death attacks that crumples your victim to dust. A very interesting addition was the ability to make death attacks using spells.
The rules were presented well and clearly, with no typos or errors that I noticed. I disagreed with the author enough on a few points that I'd likely rewrite it slightly if I used in a home game, but these points mainly did not detract from the product's value.
One relatively minor correction I would make is that the capstone ability wasn't fully updated for Starfinder. The archetype mentions true resurrection and resurrection, but neither are in the SF Core Rules. I assume they're in the Starfarer companion? It also DOESN'T mention Mystic Cure, which while a quick read of the rules makes obvious it doesn't work when enhanced death is used, it would have been nice to have that specifically mentioned. Going with just Core Options, I'm guessing only a wish/miracle can revive a creature that has been the victim of enhanced death attack and thier body crumpled to dust. Which, that's awesome actually, I love it
I also liked the small bits of detail included on blood space organizations. The idea of death kobolds is intriguing and I may" borrow" it even if I don't use blood space.
