Ok so I know the Moon Lord is the final boss at the moment but I think that they could add another, funnier, final boss. So after the Moon Lord is killed, if you talk to the guide he will say something along the lines of "you have progressed far, but I fear you will overtake me soon, I can not let that happen." And then when the chat bubble is closed he becomes an enemy who uses some sort of powerful ichor spell, similar to golden shower. This will not only be funny but to me it would feel more 'final' in a way if you know what I mean. Please leave anything you think could improve the idea or additional ideas that could tie into this one.