11 I saw another beast coming up out of the earth. He had two horns and spoke like a dragon.
12 He made everyone worship the first beast (whose deadly wound was healed).
13 He did great wonders, like make fire come down from heaven to earth.
Earth beast with two horns
14 He did miracles and told people to make an image of the beast (who was wounded with a sword but lived).
15 He made the image of the beast speak and killed whoever wouldn't worship it.
The mark of the beast: 666
16 He forced everyone to receive the mark of the beast on their right hand or on their forehead.
17 No one could buy or sell without the mark or the name or the number of the beast.
18 This is wisdom: to count the number of the beast, which is the number of a man, and it is 666.
A few more words about this episode
A woman clothed with the son (12:1)
Catholics believe that the woman clothed with the sun is Mary, but Protestants disagree, saying it's the church or Israel or something - anything but Mary.
She was fed for 1260 days (12:6)
The standard time period in Revelation. (Rev 11:2, 11:3, and 13:5)
A time, and times, and half a time (12:14)
This is generally taken to mean three and a half years [a time, (two) times, and a half (years)]. Understood in that way the three numbers that occur so often in the books of Daniel and Revelation refer to the same amount of time. Since the Hebrew month and year are approximately 30 and 360 days, respectively, forty-two months and 1260 days are about three and a half years. Most Christians who try to predict the end of the world use the day-year principle, and thereby say the end will come 1260 years after some date. The trick is to decide what year should be used to start the clock. Isaac Newton chose the year that Charlemagne was crowned as the Holy Roman Emperor by Pope Leo III - 800 CE, since that was the year he figured the Catholic Church took control of things. From that date it was a simple calculation for Newton to predict that the end would occur in 2060 CE.