Board Thread:Game Help/@comment-26179841-20150701022217/@comment-26166517-20150705144105

The Destroyer is a good first hardmode boss, but you may need better gear. Try getting full Adamantite/Titanium armor for melle or range. Also, if you're still having trouble after that, try waiting for a solar eclipse, and use the drops from the enemies(the Broken Hero Sword.) to upgrade your Night's Edge.