Board Thread:General Discussion/@comment-24463723-20140127233934/@comment-5398287-20140128005433

Well, aside from how it's the original source material and whatnot, the current and final arc is not slated to appear in anime form because of the anime's cancellation. Based on how you've only been watching the English dub, it would be in your best interest to start reading from chapter 424 of the manga, either online or in Viz volumes (buying those helps support the series); while that doesn't mark the start of the final arc, it does start the Fullbringer arc, which is important in setting up some minor and major events of the current arc.

tl;dr Yes, yes you should, especially since you are going to have a LOT of things spoiled for you if you browse the wiki without reading the current arc.