Sentence:  A number of characters in Middle-earth engage in some kind of <WSD>Faustian bargain</WSD> where they are tempted with promises of power, wealth, and status. This is how Sauron ensnares the kings of men and dwarves with the elf-crafted rings of power. 
Meaning of the word marked with <WSD> tags:  An agreement in which a person abandons his or her spiritual values or moral principles in order to obtain knowledge, wealth or other benefits.