Then the fifth angel blew his trumpet, and I saw a star that had fallen from heaven to earth, and he was given the key to the shaft of the abyss.
References for Revelation 9:1
He opened the shaft of the abyss; and smoke rose up from the shaft, like smoke from a huge furnace. The sun and air were darkened by the smoke from the shaft.
Then locusts came forth from the smoke and onto the earth. They were given power like the power that scorpions have on the earth.
They were told not to hurt the grass of the earth or any green plant or any tree. They could only hurt the people who didn't have the seal of God on their foreheads.
The locusts weren't allowed to kill them, but only to make them suffer for five months—and the suffering they inflict is like that of a scorpion when it strikes a person.
In those days people will seek death, but they won't find it. They will want to die, but death will run away from them.
The locusts looked like horses ready for battle. On their heads were what seemed to be gold crowns. Their faces were like human faces,
their hair was like women's hair, and their teeth were like lions' teeth.
In front they had what seemed to be iron armor upon their chests, and the sound of their wings was like the sound of many chariots and horses racing into battle.
They also have tails with stingers, just like scorpions; and in their tails is their power to hurt people for five months.
Their king is an angel from the abyss, whose Hebrew name is Abaddon, and whose Greek name is Apollyon.
References for Revelation 9:11
The first horror has passed. Look! Two horrors are still coming after this.