How do i make a "boss

Hello. How do I make a “boss”? since I just started using GDevelop a few weeks ago, so I! have no idea have to make a final boss for my platformer. This what I have right now

Well, think about what you want to do for a boss. What kinds of attacks you want him to do? What kind of behavior do you expect it to have?

Well i already know what i want it to do.
I want it to charge at the player sometimes after some time and to it to shoot out slimes at the player.

Use timers for the each … Times and create new objects to make the slimes appear