Excellent product that goes into depth about the failings of Merfolk in the base PF2e system and expounds upon why the alternatives are not just allowed, but arguably necessary for the ancestry to function on par with other ancestries. It highlights both its faults and its redeeming qualities; the former by adjusting them, the latter by adding greater content for them, including a wholly unexpected void healing heritage with a follow-up archetype designed with it in mind.

10/10 content. If you're planning on running a game where they'll be present, where a player is playing one, or even if you're just a fan of merfolk, this is a must-buy.