What do the details about grendel's origins and dwelling place add to your impression of him?

Grendel is living in a place we can refer to as hell (metaphorical), the place is inside mountains, a kind of cave with intense smell and waste, which produces an impression of Grendel as a vicious and insensitive entity. 
As the origin of Gredel is tracked back to Cain who killed Abel that is also adding up to the description of him being vicious, selfish and insensitive monster.

in this passage from chapter 6 of "animal farm", by george orwell, what the author is ridiculing in this passage is the frivolity of some rules.

clover, the mare, believes she remembers that the fourth commandment forbade sleeping in beds because it was something that humans did. snowball, napoleon, and the pigs are brain-workers who look after the welfare of the farm. they are the obvious leaders because they are smart, and so they are entitled to eat the best food and sleep in beds. it is squealer, who says these lines making the difference between sleeping with sheets, what humans do, and sleeping in beds, what pigs do. the unwillingness to question authority makes the oppressed to obey without thinking.