Hell is real

The realm of the dead below is all astir
to meet you at your coming;
it rouses the spirits of the departed to greet you—
all those who were leaders in the world;
it makes them rise from their thrones—
all those who were kings over the nations.

Isaiah 14:9

Isaiah here is talking about the reaction hell is having to the coming of the king of Babylon. I think that passages like this should give us sobriety about eternal separation from God and that those who do great harm and refuse to repent have themselves been decieved.