User blog comment:MegatronG144/BLADE OF GRASS my quest for the NIGHT'S EDGE/@comment-3157150-20151129024727

Why do you need to defeat the Brain of Cthulhu? If your world has corruption, you should be fighting the Eater of Worlds. Everything that requires the Crimson/Corruption boss's defeat to craft can be crafted in either case. This of course leaves out Corruption/Crimson-themed items.