Aftermath

"The world didn't know this...but I do." "I knew everything...until The Phantom was defeated." - The Guide

The Aftermath
After The Phantom is defeated, the Aftermath event will occur. All hardmode enemies won't attack you. There will be more enemies though...

The Solunar Eclipse is a special event that can occur when you get the message; "Mars shines bright tonight..." for more information on what this means, go to the page of Solar Eclipse. (And no, this wasn't copied from Harry Potter:)