Eris Goddess of Strife

Strife:
1.: bitter sometimes violent conflict or dissension
2.: an act of contention : fight, struggle
3.: exertion or contention for superiority

Eris was the Greek goddess of strife and discord. Her Roman counterpart was the goddess Discordia. Her parents are thought to be Zeus and Hera, making her the sister of Ares, but a conflicting myth states that she is the daughter of Erebos, the primeval god of darkness, and Nyx, the night. She was also the mother of the Kakodaimones, the plagues of humanity released by Pandora.

"But abhorred Eris (Strife) bare painful Ponos (Toil), and Lethe (Forgetfulness), and Limos (Starvation), and the Algea (Pains), full of weeping, the Hysminai (Fightings) and the Makhai (Battles), the Phonoi (Murders) and the Androktasiai (Man-slaughters), the Neikea (Quarrels), the Pseudo-Logoi (Lies), the Amphilogiai (Disputes), and Dysnomia (Lawlessness) and Ate (Ruin), who share one another's natures, and Horkos (Oath) who does more damage than any other to earthly men, when anyone, of his knowledge, swears to a false oath."

Hesiod

A vicious and unyielding goddess, Eris was feared by all men. Her standing amongst the gods was shaky as well, most tried to keep their distance. All of the gods and goddesses were invited to the wedding of Thetis and Peleus, except for Eris. When she attempted to attend the wedding anyways she was kicked out. In her need for revenge she quietly tossed a golden apple into the foray. It was inscribed "To the Fairest." Hera, Athena, and Aphrodite all believed that the apple Jove to name a mortal to judge who should receive the apple. That mortal was Paris, Prince of Troy. He chose Aphordite in exchange for the love of Helen. Thus began the Trojan War.

Eris (Hate) whose wrath is relentless, she is the sister and companion of murderous Ares, she who is only a little thing at the first, but thereafter grows until she strides on the earth with her head striking heaven.

Homer

This is how Eris took her revenge and grew in power as both men and gods fought a battle inspired by a little golden apple.