User blog comment:Dracula77/I need urgent help i cant kill any hardmode bosses (deja veu)/@comment-4769171-20120420130827

If you want to do the easy way of killing the Destroyer, make a medium-high Sky bridge out of Fire blocks, and do not wear anything obsidian during the fight. The Fire blocks deal low damage, and prevent the Destroyer from hitting you (about 90% of the time.)