Abaddon

The Hebrew term Abaddon (Hebrew: אֲבַדּוֹן‎ Avaddon, meaning "doom"), and its Greek equivalent Apollyon (Greek: Ἀπολλύων, Apollýōn) appear in the Bible as both a place of destruction and an angel of the abyss. In the Hebrew Bible, abaddon is used with reference to a bottomless pit, often appearing alongside the place שְׁאוֹל (Sheol), meaning the realm of the dead. https://en.wikipedia.org/wiki/Abaddon