What does Isaiah 14:18 mean?

Yet you shall be brought down to Sheol, to the depths of the pit.

Those who see you will stare at you. They will ponder you, saying, “Is this the man who made the earth to tremble, who shook kingdoms;

who made the world like a wilderness, and overthrew its cities; who didn’t release his prisoners to their home?”

But you are cast away from your tomb like an abominable branch, clothed with the slain, who are thrust through with the sword, who go down to the stones of the pit; like a dead body trodden under foot.

You will not join them in burial, because you have destroyed your land. You have killed your people. The offspring of evildoers will not be named forever.

Prepare for slaughter of his children because of the iniquity of their fathers, that they not rise up and possess the earth, and fill the surface of the world with cities.