User blog comment:ChishioKunrin/Beacon's light-up beacony tower - Is it important?/@comment-11188061-20140805012326

You should already know this way back when I posted my blog, so, I'm too lazy to repost my theories. Short point: See those huge Dust crystals? It powers Beacon Academy, and since its the frontier facing towards Grimm territory, Beacon acts like a fortress standing in the way of the Grimm.