The main qualm I have is that the Ascians said the rejoining(calamity) occurs when one of the shards (1 of 13 parallel worlds) is destroyed. But I thought a calamity was when some planet-wide elemental disaster struck, (flood, tornado, meteor, etc) caused by previous civilizations. What's the relationship between other shards being destroyed (what Ascians call rejoining/calamity) and the 7 calamities that have happen in our world (e.g. war of the Magi causing a giant flood or Allagan empire causing a calamity, or whatever?