Though they fell under the umbrella of the Eternal Night, the Myriad Sea Clans each had their own faiths and cultural norms. Some practiced Lianism, others worshiped deities connected to their bloodlines, others still worshiped none, but if there was one thing that all agreed on, it was the importance of a junior's constitution.
Physique, blood, organ, bones, together these four attributes made up a person's constitution, but even for top clans, improving these attributes was far too costly. To make a single Holy or Divine Beast Descendant undergo a basic atavism, one had to consider resources in the hundreds of millions of spirit stones. For that reason, the lottery of life played a critical role.