Cacodemon

Okay kiddo, do you know what a monster is? Yes? Good! Cacodemon is a monster from a game called Doom!

It's a big, round, scary looking creature with a huge mouth and only one eye in the middle of its head. It floats in the air and shoots fireballs from its mouth.

When you play the game, you have to shoot at it with your guns to defeat it. If you don't defeat it, it will hurt you with its fireballs.

So, it's like a big, scary balloon that tries to hurt you with fire! But don't worry, you can defeat it!