I can't help but feel like the Final Days are somehow connected to the aetherial sea/Lifestream with it being specifically noted as one of the few things even the Ancients lacked understanding and control of.

Additionally, creation magick comes across as dangerously volatile when a stray thought can easily twist the end result, plus souls were randomly getting woven into creations and causing them go berserk. The nonchalant responses of the clerk to the mishaps in Akademia Aynder or that one Ancient's reaction to his concept for a plaything trying to murder you makes it seems like accidents were a pretty routine thing; it's just that the Ancients had no qualms about sacrificing themselves for the greater good so small-scale incidents weren't anything that was considered a very big deal. Though I suppose it's also possible the picture of Ancient society Emet Selch painted was far more idealistic then it was in reality.