Our third volume concludes our exploration of the "Unseen World," delving into the existence of a formidable foe who has dedicated himself to opposing both God and humanity. This malevolent being, known as Satan or the devil, is the central figure of our study. We will meticulously examine his tumultuous journey, from his creation to his downfall, judgment, and ultimate confinement to the lake of fire. Moreover, we will investigate the strategies by which believers can triumph over this dark entity, achieving a life of victory and freedom from his grasp. While it is crucial to approach this subject with caution, Christians must possess a certain level of awareness regarding Satan's tactics, including his deceptive methods, modes of attack, and the means of resisting his temptations. By understanding these aspects, believers can live a life that honors God, unencumbered by the devil's dominion.