Abaddon

Abaddon is a word that comes from a very old book called the Bible. In the Bible, Abaddon is a word that means "destruction" or "death". It's kind of like a big, scary monster that destroys everything in its path. Some people believe that Abaddon is a real creature, while others think it's just a made-up story.

Either way, people sometimes use the word Abaddon to talk about something that is really, really bad. For example, if you had a really terrible illness or injury, someone might say that it feels like Abaddon is inside of you.

But don't worry too much about Abaddon. Even if it is real, there are lots of good things in the world too. And even if something bad does happen, there are always people who can help you feel better and make things right again.