The tenth Mandala of the Rigveda has 191 hymns. Together with Mandala 1, it forms the latest part of the Rigveda, containing much mythological material, including the Purusha sukta (10.90) and the dialogue of Sarama with the Panis (10.108), and notably containing several dialogue hymns. The subjects of the hymns cover a wider spectrum than in the other books, dedicated not only to deities or natural phenomena, including deities that are not prominent enough to receive their own hymns in the other books (Nirrti 10.59, Asamati 10.60, Ratri 10.127, Aranyani 10.146, Indrani 10.159), but also to objects like dice (10.34), herbs (10.97), press-stones (for Soma, 10.94, 175) and abstract concepts like liberality (towards the rishi, 10.117), creation (10.129 (the Nasadiya Sukta), 130, 190), knowledge (10.71), speech, spirit (10.58), faith (10.151), a charm against evil dreams (10.164).
10.15, dedicated to the forefathers, contains a reference to the emerging rite of cremation in verse 14, where ancestors "both cremated (agnidagdhá-) and uncremated (ánagnidagdha-)" are invoked.
10.47 to 50 are to Indra Vaikuntha, "Indra son of Vikuntha". Vikuntha was an Asuri whom Indra had allowed to become his second mother. The rishi of 10.47 is called Saptagu, while that of 10.48-50 is likewise called Indra Vaikuntha.
10.85 is a marriage hymn, evoking the marriage of Suryā, daughter of Surya (the Sun), another form of Ushas, the prototypical bride.