This article is about the False Prophet, you may also be looking for the related figure of the Antichrist
The Beast (rising from the sea) - greets Satan (the dragon) in a medieval art drawing.
The Beast is a prophetic monster (or, more accurately, a demon) that appears in the Biblical scripture of Revelations - although its name is often shared with Satan and the Antichrist this creature is a different entity, known as the False Prophet: however much like the Holy Trinity these three demons are sometimes considered three parts of a higher-power known as the Unholy Trinity - which together shall oppose the armies of God during Armageddon and bring great misery to humanity until their ultimate destruction on the Day Of Judgement.
The Beast is symbolised as an apocalyptic monster that shall rise from the sea with seven heads, one of which shall be mortally wounded - via trickery The Beast shall heal its wounds and be worshipped as a god amongst people, performing many miracles and leading many astray in a similiar manner to the Antichrist himself, at the height of evil's power during the Apocalypse the damned will be forced into recieving The Beast's number etched onto their hands in order to purchase food or contribute to society: traditionally this number has been noted as 666.
The scarlet dragon (The Devil), the beast of sea (the Antichrist), and the beast of the earth (the False Prophet).
The Beast, alongside the Antichrist and Satan, will have the power to decimate the world and bring calamity to humanity - those who put their faith in God shall be spared the suffering of the others (according to some traditions) while others will have to live through the End Times.
However after an undisclosed period of time (traditionally said to be around 1000 years) the world shall be saved from this tyranny when God personally intervenes, casting The Beast alongside Satan, the Antichrist and all other evils into a pit of eternal fire: destroying them forever and bringing peace to the world for eternity.