The word 'demon' is derived from the ancient Greek word 'daimōn', meaning a spirit or a divine power. This word initially did not carry the negativity of the present set of demons. Demons in today's world are supernatural and often malevolent entities. Their reference is found in all sacred and religious texts. In Christian demonology, a demon is an unclean spirit, a fallen angel, an unknown entity that cause demonic possession and can only be removed through exorcism. In western occultism, a demon is a supernatural entity that has to be conjured and controlled with specific given tasks. The following are the various classification of the demons and their abilities according to various myths, beliefs, and religious texts. Believe it or not, demons do have a hierarchy and a cosmic system. Given below are the various classifications. Fallen Angels The angels who rebelled against God with Satan are known as fallen angels. 'Satan' or 'Lucifer' was an angel known as 'Samael'―the angel of light―he became 'Lucifer' when he rebelled and was thrown down from heaven. Now, he is known as 'Abaddon'―the destroyer, and 'Apollyon'―the angel of the bottomless pit. The 'Seraphim' are the most powerful among the fallen angels. Fiery Demons These demons reside in the vast darkness of space and have least interest in the human realms. Their work is not yet defined for the human realm, they have no contact with the human race and work on a totally unknown secret agenda. Aerial Demons These demons always attempt to seek the destruction of mankind, they swarm the spirit world seeking an entry into the material world to attack humans. Terrestrial Demons These demons have settled on Earth, as they have been cast out of the heavenly realm. Often confused with shape-shifting creatures, they can take the animal as well as human form. If a terrestrial demon is killed on the earthly plane, then it dies supernaturally as well. Aqueous Demons These demons dwell in water bodies and take pleasure in drowning humans, especially children, they are often monsters that exist in deep seas, which destroy and drown ships. Subterranean Demons These demons live a very obscure life by dwelling in forgotten caves, they can be summoned to the surface only by disturbing their way of living. Bound Demons These demons are helper demons, they work under an occultist or a magician. They are bound to their master, and sometimes, they act as guides or protectors for places of treasure. 1. Power to torment mentally and physically. (Revelation 9:1-11; Luke 8:27-31) 2. Purposeful deception, create false reality. (Genesis 3:1-5,13) 3. Disguised as good spirits. (2 Corinthians 11:14-15) 4. Producing insanity; have great physical strength. (Luke 8:26-35) 5. Power over nature: Satan can produce whirlwinds, fire from heaven and great miracles in the presence of people. (Job 1:16-18; Revelation 13:13; Heb. 1:7, Psalm 104:4) 6. Power over the human body: Satan produces painful boils or welts, diseases. (Job 2:7) 7. Dumbness, blindness, epilepsy, attempted murder. (Genesis 19:11; Matthew 9:32-35; 12:22; :15,18) 8. Multiple possession; apparently seeking "rest" by possessing humans. (Luke 8:30; 11:24-26; Matthew 12:43-45) 9. Convulsions, child possession, mauling. (Luke 9:38-39) 10. Animal possession. (Matthew 8:30-32) 11. A limited prevision of the future; fortune-telling. (Acts 16:16). 12. Anger, great strength, and power. (2 Thessalonians. 2:7; 2 Pet. 2:11; Acts 19:16) 13. Treacherous nature, scheme wickedly, attack humans. (Ephesians. 6:10-16; Judges 9:23) 14. Provide supernatural revelations like telling the past and future. (Heb. 2:2; Acts 7:53; Gal. 3:19) 15. Ability to speak through an animal. (Genesis 3:1-5) 16. Can travel from one realm to another. (Job 1:7) 17. Projection of a false reality. (Matthew 4:8) 18. Ability to remove thoughts, to implant thoughts and to manipulate the mind. (John 13:2; Matthew 13:19, 38-39) 19. Deceive the nations with malicious plans. (Revelation 12:9; 20:7-8) 20. They are invisible, but there is an awareness of their presence. (Job 4:15) 21. Can take human form. (Genesis 19:1-10; John 20:12; Acts 12:8-9; Hebrews. 13:2) 22. Pagan rituals through occult practices and human sacrifice. (Deuteronomy 18:9-13) 23. Can transport human beings into surreal situations making them feel in supernatural falsity. (Matthew 24:31; Luke 16:22) 24. Limited ability over events and human actions. (1 Chronicles. 21:1; Dan. 10:13; 1 Thessalonians 2:18) 25. Are subjected to pagan worship and are pagan gods. (Deuteronomy 32:17; 1 Corinthians 10:20; Col. 2:18) 26. Child sacrifice and murder for rituals. (Psalm. 106:37) 27. Communicate by speech to humans. (1 Kings 13:18; Acts 23:9) 28. Vast in number. (Hebrews. 12:22; Matthew 26:53) 29. Speak to men; can control vocal cords, strike humans with paralysis and possession. (Luke 1:19-20) 30. Know and speak different languages. (1 Corinthians 13:1) 31. Preach a false gospel and deception about God. (1 Kings 22:19-23; Gal. 1:8; 1 Tim. 4:1; 1 John 4:1) 32. Give false visions and experiences. (Jeremiah. 23:16; Col. 2:18) 33. Can perform miracles. (Revelation 16:14) Demonic possession has been reported and has roots in many cultures and religious sects. The early case of possessions came from the Sumerian's who believed that 'sickness demons' caused a person to fall ill. Christian faith attributes possession to lower demons and fallen angels. A person can get possessed only when s/he gives the malevolent entity an entry into their life's ex―through Ouija board, seance, conjuring of demons, pact with Satan, black magic, and ritualistic practices. The signs of possession are when the victim talks and understands different languages, levitates and crawls on walls, has convulsions and fits, erased memory, change in personality, clairvoyance about people around him, hurts or injures oneself, and has superhuman strength. The only way out of this is an exorcism performed by religious heads. While widely regarded as just myths and legends, one cannot ignore their supernatural presence in the earthly realm. Every culture believes in good and bad entities that can create havoc in human life, and it is upon us to open or not to open a portal for them to contact us.