Note- This concept is from one bishop’s speculation. I do not think is a consensus among theologists.
Everyone knows about the 7 deadly sins- they are: pride, greed, gluttony, lust, envy, wrath, and sloth(-like behavior).
There are also the seven archangels of Heaven. Catholics consider these to be saints, because of what they do for God’s kingdom. They are known as, at least in the Torah: Michael, Gabriel, Raphael (these are the three known to Catholics), Uriel, Saraqael, Raguel, and Ramiel. There are also some fallen angels who used to be high up in God’s kingdom, including Lucifer, Beezlebub, and Azazel, but these, as they rebelled, were cast out of Heaven and are now demons. Archangels are important, because they serve as the Generals of Heaven’s army. They are above Seraphim and Cherubim, which are the two orders of angels.
The number seven seems to play a significant role in the Bible, particularly in Revelations. However, this might be coincedental- God needed seven angels…to do what purpose? Why did he need so many? Why can’t there be one or two angels over all of Heaven?
The answer is, they are there to protect against something. And that is, the 7 princes of hell. In Demonology, apparently there are 7 demons, who are each assigned a sin. The demons are:
Lucifer- pride (another name, IIRC, is Morgenstern, or in German, Morning Star. The name does seem to have a basis of pride in its meaning). His sin is also known as the Original Sin, as he was the one who tempted Eve to eat the apple.
Asmodeus- Lust. Asmodeus is “the black sheep” of the bunch because he is not fully demon- he is half animal, half demon. The video says that his mother was a succubus, and that his father was King David. I really don’t know how accurate this is.
These demons can possess people and the extreme end of their powers, as well as give a tendency of their sin to a certain individual at the most mild.