I had wondered if Taln's Scar could be something other than a group of stars, like maybe a nebula, another arm of the galaxy, a cosmic event of some sort, a rift in the physical realm, etc. So I looked up the description in The Way of Kings, "Taln's Scar -- a swath of deep red stars that stood out vibrantly from the twinkling white ones -- was high in the sky this season." To me this description makes some of these other theories like nebulas, cosmic events, rifts, etc. less likely since it sounds like they can make out individual red stars, or at least star like points of light in the night sky. I also wonder if the statement of them standing out from the twinkling white stars has an important hints, as in they don't twinkle and therefore aren't really stars or something similar.