Board Thread:General Discussion/@comment-25554096-20141018220101/@comment-30794628-20170206155101

Having friends helps, but I find you don't beat him legitimately unless you beat it without help. I'm also seeing people mentioning the use of items past beating the destroyer. The Terra Blade requires beating all 3 mechanical bosses, Paladins hammer requires beating Plantera. I crafted items using drops from the other mechanical bosses, like the flamethrower, and the optic staff. But if you are having trouble with all three mechanical bosses, get titanium/adamantite armor, Night's Edge, and make an arena out of platforms with heart statues, heart lanterns, honey, camp fires, and and anything that would increase your regeneration. Potions help too, like regen and ironskin (the easiest two to craft to me), which require farming of daybloom.