Chronarch (Earth-Prime)

"I'm doing you a favor by killing you now, Flash. This way, you'll never have to face the wrath of the Chronarch."

- Abra Kadabra to The Flash

The Chronarch is a future enemy of The Flash.

Forever War
In around 2049, the Chronarch became an enemy of The Flash after instigating the Forever War. Following the conclusion of the war, Allen had to leave Earth to deal with its aftermath.