Abaddon or Apollyon the only being more evil than Satan.
Who is he? It appears that he is the only character in the Bible worse than Satan. Lets look at the scriptures he appears in to see if we can shed some light on him. He appears by name seven times. Three times in Job twice in Proverbs once in the Psalms and once in Revelations. In Revelations Abaddon is also described as the Angel of the bottomless pit.
I will run through each reference and give a small description. Job 26 "Sheol is naked before God, and Abaddon has no covering." Sheol is the realm of the dead and Abaddon is described as a different place. The word Abaddon in some texts is described as destruction. It is saying these are two different places. Job28 is talking about wisdom when we come across Abaddon this time. Job 28;22, Abaddon and Death say, We have heard a rumour of it with our ears.’ Death is one of the rulers of Sheol and is an Demonic being. So Abaddon is also an spiritual being. This place that Abaddon dwells in can hear what is going on on the earth. They hear and have ears a very physical thing. Job 31;12 "for that would be a fire that consumes as far as Abaddon," This suggesting a place far away or difficult to reach.
Now Psalm 88;11. "Is your steadfast love declared in the grave, or your faithfulness in Abaddon? It then goes on to say wonders in darkness and righteousness in the land of forgetfulness. I would assume that these characteristics are what is opposite to the conditions in these places. So Abaddon has the trait of unfaithfulness.
Proverbs 15;11 Sheol and Abaddon lie open before the LORD; how much more the hearts of the children of man! This is talking about where God can see. He sees everywhere.
Let us summarise what we can see so far. That Abaddon is both a person and a place. To be more precise Abaddon is the ruler of a place that gets to be called by the rulers name. He can hear what is going on in the world even though it is far away . There is some form of physical link. The main characteristic is it is a place of faithlessness.
Now Revelations 9;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). A star fallen from heaven is given the key to the bottomless pit. This is not Satan because he has already been thrown out of heaven before the tribulations begin. Four events of the calamities of the tribulation have already happened. He has a key to unlock the abyss. That would make it a prison. It is not the part of Sheol that is the realm of the dead. That is a place where people go and not Demonic beings. Not that there aren't spiritual beings the exist only there. The Legion of demons asked Jesus not to be sent to the Abyss so he sent them into a herd of pigs who then died and that would have put them back into the second heaven. That is two places the Abyss and the second heaven. It is not part of the second heaven but somewhere they did not want to go. It is interesting that Jesus showed mercy to these creatures. God created the heavens and the earth in the beginning. Not the heavens the earth and the abyss. So the Abyss is part of a heaven and we know it is not the second heaven. It is not part of Paradise so that only leaves it as a prison in the first heaven. The first heaven is below us so in the earth the second heaven is around us and the third heaven is above us.
The Abyss is also called the bottomless pit. In physics you can not get a bottomless pit unless all gravitational forces are even. The only place that happens is the centre of the earth. So the bottomless pit is almost certainly at the centre of the earth. That would mean at some place beneath the deeoest part of Sheol the part that Death rules is another place again that is called the bottomless pit that the angels that fell before the flood were imprisoned. But from there he can reach out to the realm of the living.
If we go the Revelations 17 we find the beast that the woman rides came out of the bottomless pit. We know that the bottomless pit is a prison and it is only just been open. It is highly unlikely that another powerful fallen Angel has come out at the same time and not get a mention. This beast is also described as "The beast who once was, and now is not, is an eighth king. He belongs to the seven and is going to his destruction." I find this interesting as there are only limited amounts of opportunity for this to happen. The earliest mentions of him already have him in the Abyss. The only place I can see that he could exist on earth was before the flood. The angels that were the fathers of the giants got thrown into the Abyss for not keeping there correct place. Abaddon must have been one of these and probably the most powerful of them. This is why he is called the angel of the Abyss. So why is he called a beast? He may not be the shape of a human like angel. The Seraphim and Cherubim are types of angels, intelligent beings, but John called them beasts earlier in Revelations because they do not have human shape. Abaddon actually gets to walk our earth so it will be amazing to see. This means that from the Abyss he must be able to impose some effect on the world. He has some authority in cosmic geography. Firstly in Babylon and on through to when he is released form the pit and has direct control. Job 28;22 says he can hear what is happening on the earth so it is only a small step to believe he can do more than that. Once he is out he becomes the eight head. The USA is the seventh head and has been destroyed by fire. The Antichrist has arisen and we have one world government. The great cities of the world still exist and Abaddon is on the earth and has full control. It is in this situation that he kills the two servants. Either Moses and Elijah or two people that have the ministries of Elijah and Moses.
The gap in the first heaven that leads to the bottomless pit. Where is it. I believe that this CERN large hadron collider is the door. The site itself used to have a temple to Apollo or Apollyon the destroyer. In the front entrance the is a statue to the Indian god Shiva. The god is known as the destroyer or destruction which is also the names of Abaddon.
So that Abaddon the most evil being to ever roam the earth. Satan may be the father of lies and the main protagonist to the works of Jesus but for pure evil Abaddon's the guy. Abaddon the Antichrist and the False Prophet are the first recorded beings thrown into the lake of fire. Evil does have its rewards.
Abbadon, or Apollyon (Apollo) can all be traced back to Nimrod, or Baal. You're correct in what you wrote here being on the right track. Just as you're getting at it talks of the first (the first king Nimrod) being the last, the beast that ascends up out of the bottomless pit. I'll stop there & let you look into it yourself because as I said you're on the right track and once you start looking into it you'll see that Nimrod (Apollyon, Abaddon, Orion, Baal, etc) are all the same. It's really quite overwhelming once you start piecing it all together.
You have a very interesting list of beings. Nimrod, Abbadon, Baal and Orion. Nimrod was a man who live in our realm, the earth and part of the fall of man. Abbadon was an angelic being from before the flood and was cast into the Abyss with the other angels who did not keep their place. He is the ruler their and is able to reach out into the world. Baal is actually a common name for the gods that people worshiped. You get names like Baal Askeron Askeron being the name. The Moloch was the god of Israel and still rules today. The Israeli flag has the supposed star of David on it but it is in fact the star of Moloch and can be seen on the statues of him. A ruler of a kingdom in the second heaven. Orion is one of Lucifer's Lieutenant angels. He moves between the original heaven and the earth. Ephesians 6-12 "For we do not wrestle against flesh and blood,(Nimrod) but against the rulers(Moloch), against the authorities(baals), against the cosmic powers over this present darkness(Orion), against the spiritual forces of evil in the heavenly places(Abbadon).