Agni

Agni is a Hindu and Vedic deity. The word agni is Sanskrit for "fire" (noun), cognate with Latin ignis (the root of English ignite).

The sacrifices made to Agni go to the deities because Agni is a messenger from and to the other gods. He is ever-young, because the fire is re-lit every day; but also he is immortal.

Depictions
In Hindu art, Agni is represented as red and two-faced, suggesting both his destructive and beneficent qualities, and with black eyes and hair, three legs and seven arms. He rides a ram, or a chariot pulled by goats or, more rarely, parrots. Seven rays of light emanate from his body. One of his names is Saptajihva, "having seven tongues".


Agni in the Vedas
His name is the first word of the first hymn of the Rigveda:-

"Agni I laud, the high priest, god, minister of sacrifice, The invoker, lavishest of wealth."
He is the supreme director of religious ceremonies and duties, and figures as messenger between mortals and gods. Vedic rituals concerned with Agni include the Agnicayana, that is, the piling of the fire altar, the Agnihotra, viz., invocation of Agni.

The Rigveda often says that Agni arises from water or dwells in the waters. He may have originally been the same as Apam Napat. Other Rigvedic names, epitheta or aspects of Agni include Matarishvan, Bharata and the Apris.

Agni is a deva, second only to Indra in the power and importance attributed to him in Vedic mythology, with 218 out of 1,028 hymns of the Rigveda dedicated to him. He is Indra's twin, and therefore a son of Dyaus Pita and Prthivi. He is married to Svaha, "oblation" personified.

He is one of the Guardians of the directions, representing the southeast.


 Agni as witness
Although the Vedic fire-sacrifice (yajña) has largely disappeared from modern Hinduism (with the exception of small Shrauta communities), Agni with the fire-sacrifice is still the mode of ritual in any modern Hindu marriage, where Agni is said to be the chief sakshi or witness of the marriage and guardian of the sanctity of marriage. Taking Agni (fire) as a witness is a very old tradition - in the Valmiki Ramayana, Rama and Sugriva swear to help each other and circle the fire thrice as a seal of their bond. Similarly in the Mahabharata, Susarma and his brothers the Trigartas swear by the fire to either defeat Arjuna or die at his hands, their joint oath earning them the name of "Samsaptaka" as a clan.


Agni in Ayurveda
According to Ayurveda, Agni is the biological fire that governs digestion, metabolism and the immune system.


Agni in other faiths and religions
In Indo-Tibetan Buddhism, he is a lokapāla guarding the Southeast. Jigten lugs kyi bstan bcos: which translates, "Make your hearth in the southeast corner of the house, which is the quarter of Agni". He also plays a central role in most Buddhist homa fire-puja rites.


Agni in Castlevania series
There is a fiery sword in some Castlevania games called "Agni's Flame". Also, there is a fire god boss named Aguni.