The locusts looked like horses prepared for battle. On their heads they wore something like crowns of gold, and their faces resembled human faces. 8 Their hair was like women’s hair, and their teeth were like lions’ teeth. 9 They had breastplates like breastplates of iron, and the sound of their wings was like the thundering of many horses and chariots rushing into battle. 10 They had tails with stingers, like scorpions, and in their tails they had power to torment people for five months. 11 They had as king over them the angel of the Abyss, whose name in Hebrew is Abaddon and in Greek is Apollyon (that is, Destroyer).
12 The first woe is past; two other woes are yet to come. (Revelation 9:7-12)
In this passage we see a vivid description of what are apparently demonically inhabited creatures that will torment unbelievers during the tribulation period. These ugly, disgusting, terrifying creatures will be able to cause unspeakable pain and torment while at the same time making it impossible for their victims to commit suicide (verse 6). They are apparently ruled over by a creature named “Abaddon” who may be a head demon or perhaps Satan Himself.
Once this is over, the first “woe” will be past, but two more “woes” are yet to come. I pity the fool who rejects the mercy of God and casts themselves upon the “mercy” of these demons.