Horkos in the context of Oath

Orcus was a god of the underworld, punisher of broken oaths in Etruscan and Roman mythology. As with Hades, the name of the god was also used for the underworld itself. Eventually, he was conflated with Dis Pater and Pluto.

A temple to Orcus may once have existed on the Palatine Hill in Rome. It is likely that he was transliterated from the Greek daemon Horkos, the personification of oaths and a son of Eris.
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The Seven against Thebes were seven champions in Greek mythology who made war on Thebes. They were chosen by Adrastus, the king of Argos, to be the captains of an Argive army whose purpose was to restore Oedipus' son Polynices to the Theban throne. Adrastus, although always the leader of the expedition against Thebes, was not always counted as one of the Seven champions. Usually the Seven were Polynices, Tydeus, Amphiaraus, Capaneus, Parthenopaeus, Hippomedon, and either Adrastus or Eteoclus, when Adrastus is excluded. They tried and failed to take Thebes, and all but Adrastus died in the attempt.

On their way to Thebes, the Seven stopped at Nemea, where they held funeral games for the infant Opheltes, which became the origin myth for the Nemean Games. Before arriving at Thebes, Adrastus sent Tydeus on ahead to resolve the dispute through negotiation, which failed. At Thebes, Capaneus was struck down by Zeus' thunderbolt while attempting to scale the city walls. Tydeus was mortally wounded, and although Athena intended to make him immortal, she let him die when she saw him eating the brains of his attacker. Polynices was killed by (and killed) his brother Eteocles, the seer Amphiaraus was swallowed up by the earth, and Adrastus escaped the battlefield on his divine horse Arion. The victorious Thebans refused to allow the burial of the Argive dead, but Theseus marched an Athenian army to Thebes and recovered the bodies of the fallen warriors.