User blog comment:TheBlueRogue/The Iron Banner Returns/@comment-3147846-20150114203716/@comment-5405207-20150115201245

Thanks for the clarification, I'd remedied the info in my post. To answer your question about the buff, I say it's worth it and only becomes more worth it the less time is left in the Iron Banner. If you want to grind as quick as possible, purchasing it as often as you can will certainly help. A single Mote of Light isn't very high of a price.