how about.....The Spectre? He God's vengeance personified
"The Spirit of Vengeance, Spirit of Redemption, Avenging Wrath of God, The Man of Darkness, Raguel"
and his powers:
"Divine mystical enhancements granting virtual omnipotence, although the true scope ranges from the dictates of the Presence.
Knowledge of events before the Crisis on Infinite Earths"
he, in the DC universe, was responsible for "the Spectre was the Angel of Death who slew the firstborn Egyptian children."
and he razed and killed the population of an entire country he deemed guilty of murder, has power over matter, time, life and death...and he was part of the Justice Society of America.
other powerful superheroes would be the Phantom Stranger (unkillable), Resurrection man, Booster Gold (time travel, can change the time line if he really wanted to), wave rider, Sandman (the god of dreams from Neil Gaimans Endless), Captain Atom (the DC universe counter part of Charleston Comic's Dr. Manhattan), Captain Marvel (or Shazam! ), the Flash, Ion (Kyle Rayner before he restarted the main power battery, he had near omnipotent powers, control over space time and can resurrect the dead)