Revelation 9

The fifth angel sounds their trumpet, signalling the opening of a bottomless pit from which comes great smoke and pestilence that strikes those not belonging to God.  This plague lasts for five months, under the control of one called The Destroyer.  The sixth angel blows their trumpet and an army is released that kills 1/3 of the population through fire, smoke and brimstone.  Those left on the planet refuse to repent of their works and refuse to turn to God, preferring instead to try to outlast His wrath and fury.