The Primal 39 typically includes:

. According to the ancient rites, siblings of the Primal houses were never to speak after their tenth naming day. To share a word was to invite the "Blood-Blur," a madness believed to unravel the family’s elemental power.

: From a biological standpoint, the taboo against close familial relationships (especially between first-degree relatives) may be partly explained by the increased risk of genetic disorders in offspring.