Truthfully, Abbadon (Abbaton) was not the one who had any involvement in writing the scripture in Joel 3.2 (Hebrew text, 4): "I will gather together all nations, and will bring them down into the valley of Josaphat: and I will plead with them there for my people, and for my inheritance Israel, whom they have scattered among the nations". Abaddon is a name that is a judgement given by God down upon the Devil against the Devil because the Devil had many times committed the heretical and blasphemous crime of making the Devil appear as if the Devil was/is/will be God. Whereas the name Apollyon is a judgement given by God down upon the Devil against the Devil because the Devil had many times committed the heretical and blasphemous crime of making the Devil appear as if the Devil was/is/will be Jesus Christ. Please read the revelation of Jesus Christ about what God and Jesus Christ and the Holy Spirit had justly said against Abaddon and Apollyon. Abaddon and Apollyon are revelated as the beast who will go in to destruction at a particular time chosen by God. 

  
 If you erase what I have written here while telling me again that I should not make changes because it violates wikipedia's "rules", then please remember, it's not me but it's wikipedia who have assumed things about Abaddon and Apollyon and who have therefore written nasty lies about what God had truly signified about Abaddon and Apollyon and therefore, it's wikipedia who's the one who's committing the violation because it's wikipedia who's trying to feed people with lies about important scripture instead of doing their own good biblical homework first before writing any documentary on their own website about biblical history. **