Mandala 5, credited to the Atri family, is the largest of the family books after Mandala 7, and its 87 hymns give somewhat broader attention to Mitra-Varuna, the paired deities of covenant and cosmic order, and to the Vishvadevas, the gods invoked collectively, than most other family books manage alongside their expected core of Agni and Indra hymns. Atri himself is one of the most storied rishis in later Hindu tradition, credited across Puranic literature with surviving a trial by fire after being thrown into a blazing pit, an episode some scholars connect loosely to certain fire and rescue imagery within the Rig Vedic hymns credited to his family, though the later legend elaborates far beyond anything the Vedic hymns themselves narrate directly.
The mandala includes hymns addressed to the Maruts, the storm gods who accompany Indra into battle, and to Surya, the sun, continuing the family books' consistent pattern of covering the major deities of the developing Vedic pantheon through a single lineage's inherited poetic voice, even as each family, Atri's included, leaves its own recognizable stylistic signature across its portion of the collection. A small number of hymns within the family book are credited not to Atri himself but to other named members of his lineage, reflecting the general pattern across the family books that authorship rests with an entire hereditary line of poet-priests rather than with one individual across every single hymn attributed to it.