Board Thread:New on Terraria Wiki/@comment-113.165.57.205-20130613011919/@comment-24013733-20131020055425

If your world has The Crimson, gear up with Adamantite/Titanium Armor, and get a good amount of Ichor (from memory, you need around 30). Purchase the Book from the Wizard, and collect ~20 Souls of Night from the Underground Crimson. This'll get you the GOlden Shower, which is capable of killing the Destroyer in under a minute.